Historian's Note: All dates relating to the Great Crusade and the Horus Heresy are only approximations as Imperial records from this time are too fragmentary to be wholly reliable.

000.M31 Triumph of Ullanor Following the defeat of the Orks of Ullanor, the Emperor of Mankind returned to Terra to begin work on his vast project to open up the Eldar Webway for Mankind's use. In his place to command the vast forces of the Great Crusade he left Horus. Horus was raised to the rank of Imperial Warmaster and given command authority over all of his fellow Primarchs and every Expeditionary Fleet of the Great Crusade. But the Primarchs never came to terms with the Emperor's absence. Their hurt feelings over his seeming abandonment of the Great Crusade to pursue a secret project whose purpose he chose not to reveal to his sons laid the seeds of corruption that would ultimately blossom into the Horus Heresy. Yet the Emperor sent word from Terra that in honour of the great victory at Ullanor, the Luna Wolves should henceforth be known as the Sons of Horus, in honour of their Primarch's singular deeds, though Horus, with typical humility, chose not to rename his Legion at this time.
The Fall of Saran Luxor This is a little known Imperial campaign that occurred during the last years of the Great Crusade involving unknown forces.
001.M31 Subjugation of the Akum-Sothos Cluster Aukum-Sothos Cluster, which had been brought into Compliance by the Luna Wolves early in the Great Crusade had rebelled against Imperial rule due to the actions of controlling xenos. Horus had formulated a plan to cast down the so-called Unsighted Kings, the xenos-possessed leaders of the insurrection, in a lightning war that would purge the afflicted population while retaining the cluster's highly developed infrastructure for future re-population. The Warmaster's plan called for the bulk of four Legions -- the Luna Wolves, Space Wolves, Iron Warriors and Raven Guard -- to converge on the heavily fortified lair of the Unsighted Kings before a final, overwhelming assault was launched. Despite his misgivings, Primarch Corvus Corax complied, and assigned the majority of the Terran-borne veterans of the old XIX Legion as the assault's vanguard element. At the height of the battle, with the assault companies decimated and the attack faltering in the face of overwhelming fire, Corax himself led the forlorn hope, his battle cry firing the Legion to such efforts that the breach was carried and Gate Forty-Two taken. The honour of slaying the Unsighted Kings was claimed by Horus as Warmaster and at the moment of their execution, the xenos' hold over the population was dispelled. The Akum-Sothos Cluster was delivered and Horus' prize was reclaimed. The cost was terrible however, thousands of Raven Guard, the bulk of them Terran-born, had given their lives before the shattered walls.
Cleaning of 28-3 (Laeran) When the Emperor's Children 28th Expeditionary Fleet encountered the xenos race known as the Laer, they saw the potential for a powerful foe. Seizing the initiative, the 28th Expeditionary Fleet attacked their home world of Laeran, for Fulgrim saw the blasphemy in allowing a vile alien race to hold the ideal that they were as perfect as the human form. He ordered his Lord Commanders to attack immediately, beginning a war that the Council of Terra predicted would last for decades. Fulgrim heard this prediction, and shook his head. In one month`s time, he promised, the Imperium would rule Laeran. The Laer never surrendered -- their last warriors died fighting in the ruins of their capital city to protect their central temple dedicated to the worship of the Chaos God Slaanesh, where the Primarch discovered the mysterious Silver Blade of the Laer. This would mark the beginning of Fulgrim's and the entire III Legion's damnation and the beginning of their turn away from the service of the Emperor.
First Kobolt War - Razing of Thuyela The 40th Expeditionary Fleet encountered a race of unusually humanoid xenos in Kobolt space who were lethal and proud, and had no interest in human affairs. The xenos' base of operations was a great transparent vessel that sparkled as if it was made of glass, and so was nicknamed by them as "Scintilla City". It was in actuality an Eldar Craftworld, and was called Thuyela in the Eldar Lexicon. True to their capricious nature, the Eldar of Thuyela attacked the 40th Expeditionary Fleet without apparent reason or explanation, and managed to fight the Imperial fleet to a standstill. Fleet commanders called for the help, which came in the form of the Space Wolves' 3rd Great Company ("Tra" Company). The Space Wolves decimated Thuyela. It was so completely destroyed that there was nothing left for the Imperial forces to recover or plunder. Horrified by their "allies'" actions, the commanders of the 40th Expeditionary Fleet were disinclined to call upon the Space Wolves for help again, but would do so when they next encountered the race known as the Olamic Quietude.
Second Kobolt War - Suppression of the Olamic Quietude The 40th Expeditionary Fleet was an expeditionary force during the Great Crusade that was shadowed by an Astartes complement made up of the Space Wolves' 3rd Great Company ("Tra" Company). During the Second Kobolt War, the 40th Expeditionary Fleet met up with the Space Wolves near Gogmagog Beta, pressing fruitlessly into the territory of the cybernetic Abhumans called the Olamic Quietude. The Space Wolves assaulted the orbital docks of the cybernetic abhumans' homeworld, and through the utilisation of specialised weapons, stealth and brute force were able to overcome their elite soldiers, known as 'Robusts'. With their defences deactivated, this allowed for the follow-on planetary assault on the Quietude's ice-covered homeworld and the inevitable destruction of their civilisation.
ca. 001.M31 The Council of Nikaea A great Imperial conclave called by the Emperor of Mankind during the early 31st Millennium on the world of Nikaea in the midst of the Great Crusade that was intended to determine whether or not the use of psychic sorcery represented a boon or a grave danger to Mankind and the newborn Imperium of Man. Ultimately the existence of psykers in the Imperium was allowed but tightly restricted under centralised Imperial control, while the potent and unrestricted use of psychic abilities that was defined as sorcery was officially banned. The psychically powerful Primarch Magnus the Red and his Space Marine Legion the Thousand Sons would continue to study such powers in secret on their homeworld of Prospero, ultimately leading to their damnation by Chaos during the early days of the Horus Heresy.
Compliance of 63-19 Forced off course by a Warp Storm, the Luna Wolves' 63rd Expeditionary Fleet discovered a system of nine planets orbiting a yellow sun quite by accident. After entering the system they were contacted by a technologically-advanced human society based on the third planet. This world was ruled by a self-appointed "Emperor of Mankind" who claimed to be the predestined ruler of all the scattered remnants of humanity across the galaxy. Though initial negotiations appeared to proceed smoothly, soon talks broke down, which resulted in rising hostilities. Horus miraculously did not order an immediate retaliatory strike. Instead, he mobilised an Astartes "speartip" unit to stand by and prepare for a planetary assault. Horus then attempted to negotiate a second time by despatching Maloghurst and another contingent of Luna Wolves, but this mission also ended in disaster when Maloghurst's Stormbird was shot down and presumed lost. massive ground assault spearheaded by the Luna Wolves was led by First Captain Ezekyle Abaddon, as well as a half-dozen Titans which provided ground support while Assault Craft provided close-air support. The Luna Wolves were eventually able to close and penetrate the capital city's defences, and came face-to-face with the so-called "Emperor". 1st Company Captain Kalus Ekaddon, commander of the Catulan Reaver Squad, swiftly killed the man he believed to be the false Emperor. Then the true false Emperor revealed himself, striking with deadly force against those Luna Wolves that were present, and nearly succeeded in neutralising both Captains Garviel Loken, Ekaddon and the other members of the Catulan Squad. He was only stopped by the timely intervention of the Luna Wolves' Primarch, as Horus teleported directly into the Throne Room and slew the false Emperor with a single, well-aimed Combi-Bolter shot to the head. The main part of the campaign was concluded with the death of the false Emperor. With the death of their leader, the main resistance on 63-19 collapsed.
Compliance of 140-20 (Urisarach/"Murder") After victory against the Laer, Lord Commander Eidolon departed the 28th Expeditionary Fleet with the elite 1st Company of the Emperor's Children to take part in the reinforcement of the Blood Angels 140th Expeditionary Fleet's compliance of the Death World of Urisarach. Unknown to the Imperial forces this planet was in actuality a prison world for the dangerous sentient xenos species known as the Megarachnids. These large arachnid-like xenos were described as too numerous and formidable to defeat without reinforcements, and caused heavy losses amongst the Imperial forces. This earned Urisarch's informal appellation of "Murder". A company of the Emperor's Children Legion under the command of Lord Commander Eidolon eventually arrived in response to the Blood Angels' distress calls, but soon took heavy casualties themselves. The situation did not improve until the arrival of the 63rd Expeditionary Fleet and a large force of Luna Wolves, tens of thousands of Imperial Army forces and Titans of the Legio Mortis deployed to the planet's surface to assist the beleaguered Legionaries. By the sixth month of the campaign it seemed the Megarachnids would soon face extinction when the fleet deployed by the Interex arrived in-system to determine who had assaulted the Megarachnids' reservation world. Finding contact with the highly-advanced humans of the Interex to be a more pressing issue that needed to be dealt with, the Commander Horus Lupercal ended the campaign against the xenos of Murder.
The Interex Compliance The Interex was a highly advanced civilisation of humans that maintained a close alliance with various xenos races, including the ape-like Kinebrach. In many ways their technology was even more highly advanced than the technology employed by the Imperium at its height. Their world of Xenobia was first encountered by the 63rd Expeditionary Fleet during the Great Crusade. The Interex were devoted to fighting the menace of Chaos (referred by them as "Kaos") and were therefore highly suspicious of the Imperium's intentions, as they believed that the interlopers from Terra might be servants of the Ruinous Powers. While Horus and his Mournival were treating with the leaders of the Interex, First Chaplain Erebus of the Word Bearers, who had been accompanying the Warmaster as part of his entourage and who was already a secret follower of the Chaos Gods like most members of his XVIIth Legion, infiltrated the Hall of Devices on Xenobia, a museum that contained various artefacts and weapons drawn from the history of the Interex and their allied alien species. His objective was to steal the highly valuable and deadly Kinebrach blade known as the Anathame, a Chaotic artefact sacred to the Plague God Nurgle. After claiming the blade, Erebus rigged the building to explode to make good his escape. Feeling betrayed by the Imperials, who they took for agents of Chaos for stealing a known Chaotic artefact, the Interex's troops immediately attacked the bewildered forces of Horus, sparking a deadly confrontation. The Warmaster was evacuated off-planet by his Astartes as the Luna Wolves unleashed their full might upon the Interex. The Anathame would later play a pivotal role in the corruption of Horus by the Dark Gods upon Davin's Moon. The Interex were later destroyed by an Imperial campaign and all of their worlds were brought into Imperial Compliance.
Diasporex Persecution During the latter part of the Great Crusade, the Iron Hands Legion's 52nd Expeditionary Fleet encountered a nomadic, fleet-based civilisation composed of both humans and xenos known as the Diasporex. The Iron Hands shared the Imperial Truth of the Emperor of Mankind and offered the human members of the Diasporex the opportunity to separate from their alien allies and to join the newly forged Imperium, but they declined the Astartes' offer. Their offer rejected, the Iron Hands passed judgement, and in the following months the Iron Hands fleet attempted to annihilate the Diasporex, but they proved to be highly skilled and experienced in the realm of naval warfare. The Emperor's Children of the 28th Expeditionary Fleet were called in as reinforcements, and so, a joint Imperial strike force composed of both the Iron Hands and forces from the Emperor's Children Legion prepared to launch an all-out assault against the willful Diasporex. During the massive naval battle that ensued Fulgrim's personal gunship, the Firebird, came under heavy attack and soon found itself in trouble. Rushing to his brother's side, Ferrus Manus' flagship, the Battle Barge Fist of Iron, came rushing to the rescue of his beleaguered brother. Due to the continuing influence of the daemonically-possessed Silver Blade of the Laer still in Fulgrim's possession, the Phoenician's pride was wounded. He felt that his brother Ferrus Manus had slighted him and was convinced that he was acting both prideful and that his actions were rash, instead of seeing them as the truly were -- humble and heroic. This drove a further wedge between the two brothers that would eventually come to a head years later.
Compliance of 154-4 (Ibsen) This was a joint compliance carried out by multiple Legiones Astartes (Salamanders, Iron Hands & Death Guard) on the verdant world of Ibsen, The population of this world was a rare example of Eldar/Human coexistence. Upon further inspection, it was discovered that these human were in fact descendants of the Salamanders' home world of Nocturne who had been liberated from Dark Eldar captivity by their Craftworld kin. During the campaign the Iron Hands' Primarch, Ferrus Manus, went missing temporarily, as two Eldar Seers attempted to show him precognitive visions of the future and warn him of his impending doom. The Gorgon dismissed this visions as a simple trick. With the population fighting the Imperial forces at every turn, and unwillingly to accept the Imperial Truth, Vulkan was left with no other choice and ordered Ibsen and its irredeemably corrupted population cleansed by flame. He renamed the scoured, Nocturne-like Dead World that remained, be renamed Caldera. The world was now ready to receive new human colonists and to be exploited for the benefit of the Imperium.
Compliance of 154-6 (Kharaatan) Not long after the successful conclusion of the campaign on Caldera, Vulkan and his Salamanders Legion participated in another joint Imperial Compliance action on the world known as Kharaatan. Designated 154-6, the Salamanders fought alongside the Primarch Konrad Curze and his Night Lords Legion as well as Mechanicum forces of the Legio Ignis Titan Legion and several Imperial Army regiments. During this campaign Vulkan became infuriated with his brother Primarch and how his Legion brutally conducted themselves. During one notable incident, the Night Lords slaughtered the inhabitants of an entire city in order to seed fear amongst the general population. When he confronted Curze about his Legion's actions, a brief fight ensued between the two demi-gods. After the successful conclusion of this campaign, Vulkan reported Curze's conduct to both Warmaster Horus and his brother Primarch Rogal Dorn of the Imperial Fists Legion. This incident would later sow the seeds of animosity between Vulkan and his brother Curze, causing a rift that would further widen as the Great Crusade wore on. The events on Kharaatan would have far-reaching affects that would later play a key role in what happened to Vulkan after the tragic events of Istvaan V played out.
002.M31 The Preaixor Campaign This was an Imperial Compliance campaign that was jointly carried out by the Death Guard and the Emperor's Children Legions. During this campaign, Captain Saul Tarvitz of the Emperor's Children earned Death Guard Battle-Captain Nathaniel Garro's amity, proving to him that for all the reputation of Fulgrim's Astartes as overconfident peacocks, there were still men amongst the ranks of the III Legion that embodied the ideals of the Imperium. The two became Honour Brothers, carving a small eagle on each others vambrace by knifepoint, a sign of the battle debt they owed one another. When they clasped each others' vambraces in a warrior's handshake, the two eagles joined together to form the Imperial Aquila.
Compliance of Krypt The Compliance of Krypt was a relatively short campaign conducted during the Great Crusade by both the Luna Wolves and the Death Guard Legions against the Orks upon the frozen plains of the world of Krypt. Fighting together for more than a week across the frozen surface of the planet, the Space Marine Legions turned the blue ice dark with xenos blood. The Luna Wolves' Captain Garviel Loken and his 10th Company are known to have fought alongside Death Guard Battle-Captain Nathaniel Garro and his 7th Great Company at this time.
Compliance of Fortrea Quintus The world of Fortrea Quintus had been isolated from Imperial rule for several centuries, and when the leading edges of the Great Crusade reached the frontier of their star system, the planet's governing monarchy proved unwilling to submit itself to Imperial rule and had the Emperor's representatives executed. The Word Bearers were the nearest Legion to the world, though they were already heavily engaged in fighting Orks in the Chairak Nebula. Lorgar despatched 2,000 Astartes to Fortrea Quintus with orders that the planet be pacified within three months. The Word Bearers quickly established fortified positions on the planet and found the populace to be living in abject poverty, while their corrupt and ruthless rulers grew fat off their hard labours. A well-trained and disciplined army defended the planet's rulers, equipped with advanced weaponry and artificially-intelligent war machines. Under the command of Captain Jarulek, the Word Bearers steadily pushed their enemies back, their captain rousing the populace against their rulers with stirring speeches and fiery oratory. In ever-increasing numbers, the people of Fortrea Quintus joined Jarulek's march until his army numbered more than a million people. A month after the Word Bearers had landed, Captain Jarulek, together with his millions of new followers, launched his assault on the planetary ruler's last bastion, the Palace of Light. The casualties amongst the populace were horrendous,with thousands dying every minute as they charged the heavily defended walls, armoured bastions and labyrinthine trench systems of the main gates armed with little more than pistols and spears. As the carnage continued at the main palace gates, the Word Bearers attacked on another front, catching the defenders off-guard and striking for the heart of the palace. Nothing could stand before them and Jarulek himself captured the planet's ruler, throwing him to the blood-maddened survivors of the battle at the gates where he was torn to bloody shreds. Fully 90% of the people who had joined Jarulek's march died in the battle for the main gates, whilst barely a handful of Word Bearers had been killed. Following the victory, Jarulek began the Imperial indoctrination of the populace. When the Adepts of the Ministorum arrived to bring the word of the Emperor to Fortrea Quintus, they were horrified by the Word Bearers careless use of the populace, but found the people as well versed in the culture of the Imperium as any Loyal world could be. But when the Horus Heresy began, Fortrea Quintus would be revealed as a hotbed of Chaos worship secretly planted by the Word Bearers. After the end of the Heresy, the Ultramarines Legion would be forced to purge the planet of its festering Chaotic corruption by exterminating its population.
ca. 001-005.M31 The Chondax Campaign Shortly after the Triumph of Ullanor, Jhagatai Khan and his Vth Legion were next sent to the worlds of the Chondax System. The system was comprised of the planets Epihelikon, Teras, Honderal, Laerteax and Phemus IV, the furthest of the outlying worlds. The culmination of this campaign took place upon the world of Chondax, labeled Chondax Primus EX5, 776 NC-X-S by Imperial cartographers, but named "The White World" by the White Scars due to its salt-like earth. The White World was the crucible of the whole campaign, the heart of those Greenskin forces that had chosen to go to ground in the system. The Khan was ordered by the newly-promoted Warmaster Horus to hunt the remnants of the Ork empire destroyed on Ullanor, the last slivers of the Warlord Urlakk Urruk's Greenskins. The brutal campaign lasted six long standard years as the White Scars hunted the remaining Greenskin forces to extinction. It was at Chondax that the White Scars would first learn of the outbreak of the Horus Heresy and the betrayal of Horus Lupercal. Delayed by the arrival of the fleet of the Alpha Legion, the White Scars would break-out from the Traitors' cordon and begin the long journey back to Terra in search of answers -- leaving multiple Alpha Legion warships as flaming wreckage in the bargain.
ca. 002-003.M31 The Kayvas Belt Persecution Many tribes of Orks, scattered and leaderless after the hammerblow they had suffered at Ullanor during the Ullanor Crusade, had fled to the points of the etheric compass – and many had come to rest in the Kayvas Belt, where they carved new outposts out of the drifting, mineral-rich rocks, licked their wounds while they re-armed. The Alpha Legion's 88th Expeditionary Fleet had tracked them to their lair and petitioned the Warmaster Horus for the reinforcements required to prosecute their plan of annihilation, but after the war at the world called Murder and the disastrous engagement with the civilisation known as the Interex, the Luna Wolves had been reluctant to commit ships to Alpharius' new campaign. In the end, it was the Blood Angels who agreed to assist their cousins in the XX Legion, with Sanguinius himself marshalling a sizable intervention to support the efforts of the 88th Expeditionary Fleet. The mission, Alpharius said, would be five standard years in execution. The Angel rejected that premise and promised it would be over in one, and he committed vessels from every active Blood Angels expeditionary fleet to the cause. Sanguinius was proved right -- more or less. Just over thirteen months after the commencement of the Kayvas initiative, the Orks were almost totally annihilated.
ca. 003.M31 The Luna Wolves are renamed the Sons of Horus
Contact lost with Istvaan System Six solar years after the last official communiqué from Istvaan III, a Death Guard patrol ship on the outer edge of the Legion's fleet, picked up an incomplete astrotelepathic transmission which indicated that Istvaan III was in open religious rebellion, the Imperial government had collapsed, and the Planetary Governor Vardus Praal, now turncoat and perhaps turned mutant or psyker, was leading the revolt.
The Vespae Incident This is a little known Imperial campaign that occurred during the last years of the Great Crusade involving unknown forces.
ca. 004.M31 Davin Campaign and the Fall of Horus Warmaster Horus is grievously wounded while fighting rebels on Davin's moon. He is healed within the ancient Serpent Lodge of Davin but though his life is saved, his soul is forfeit to the Ruinous Powers. From this day he makes his plans to bring the Imperium to ruin and topple the Emperor from power. Though his treachery and malign intent remain hidden, he begins his far-reaching conspiracy to suborn those of his brothers' Legions and the other forces of the Imperium who will aid him and neutralise the threat of those who will not where he can, while preparing in secret to fight a sudden and ruthless civil war.
The Destruction of Olympia While the Iron Warriors Legion were cleansing the world of Gugann of a major infiltration of the infamous xenoform known as the Hrud, the long-lived Satrap of Olympia died. With the death of the Tyrant of Lochos, the Iron Warriors' home world erupted into infighting and insurrection. The population had taken up arms against the Imperium following years of relentless anti-Imperial propaganda by the dead Tyrant. Tired of repeatedly having to prove himself, and enraged at the disregard his fellow Legiones Astartes, Perturabo and the Iron Warriors brutally suppressed the rebellion on the streets of the city-states of Olympia. No one was spared. It was the principle of surrender or no quarter, and the Iron Warriors had grown accustomed to granting no quarter. Perturabo watched as the Olympian fortifications in which he had once taken such pride were overcome. By the time the massacre was over, Olympia had been culled into slavery. Five million civilians had been killed in the process.
Destruction of the Auretian Technocracy The already corrupt Horus assassinates the Auretian Technocracy's leader, the Fabricator Consul, who represented the human government, in order to obtain highly-coveted lost STC. Horus later uses this illicitly recovered STC to entice Fabricator-General Kelbor-Hal to join the Traitor cause and planting the seeds of the Dark Mechanicum and the eventual Schism of Mars.
Battle of Tarsus Primarch Fulgrim meets with the renowned Eldar Farseer Eldrad Ulthran of Craftworld Ulthwé on the Maiden World of Tarsus, in which the Farseer attempted to warn Fulgrim of the Warmaster's corruption, after being wounded by a malefic Chaos blade known as the Kinebrach Anathame, at the hands of the traitor Eugen Temba upon Davin's Nurgle-corrupted moon. Fulgrim reacted with violent outrage at the Farseer's accusations due to his close kinship with his brother Horus. This outrage was further enhanced by the corrupting influence of Fulgrim's Laer daemonblade, which darkly influenced the Primarch to reject the Eldar's truth and provoked Fulgrim into launching an unprovoked and furious attack on Eldrad and his retinue alongside his Emperor's Children Captains and his personal Phoenix Guard. In the battle that ensued, the Emperor's Children slew both the revered Eldar Wraithlord Khiraen Goldhelm and a potent Avatar of Khaine, which forced the Farseer and the other Eldar troops to sorrowfully withdraw, as they realised that Chaos had already claimed yet another of the "Mon-Keigh's" Primarchs. Yet they had succeeded in killing all of Fulgrim's elite personal Phoenix Guard before their departure. Believing the Eldar had proven themselves a treacherous xenos race that sought to divide and conquer the Imperium by spreading such lies about its leaders, Fulgrim, again under the increasing influence of the daemonblade, ordered the destruction of several other beautiful Eldar Maiden Worlds using hideous virus bombs.
Battle of Deep Orbital DS191 Following this delegation to the 63rd Expeditionary Fleet, Fulgrim announced to his senior commanders that he would lead a small force to join Ferrus Manus and his Iron Hands at Callinedes IV in the Callinedes System under the pretense of clearing it of an Ork infestation. The Primarch spearheaded the assault during the pacification of Deep Orbital DS191, leading the 1st, 2nd and 3rd Companies. During the assault, Captain Solomon Demeter, commander of the Emperor's Children's 2nd Company, found himself unsupported by the 1st and 3rd Companies as the battle-plan had laid out. Overextended and in real danger of being cut off and destroyed, the 2nd Company was only saved from certain destruction by the unplanned and timely arrival of the 10th and 13th Companies under the commands of Captains Saul Tarvitz and Lucius, two junior officers that Demeter had found himself associating more and more with as he was systematically frozen out by the III Legion's high command. A dark shroud hung over Lord Commander Vespasian after witnessing these dishonourable actions. He felt obliged to act after he observed Solomon Demeter's 2nd Company being intentionally abandoned by both Captain Kaesoron's and Vairosean's companies. It was a decision that would cost the honourable Astartes his life when he was murdered by the Chaos-corrupted Fulgrim himself.
Vulpa Straits Hrud Migration Commanding the 51st Expeditionary Fleet, the Warsmith Barabas Dantioch led a large Iron Warriors contingent against a massive xenos incursion known as the Vulpa Straits Hrud Migration. Upon the Fortress World of Gholgis the Hrud infiltrated and destroyed the Iron Warriors garrison. The intense entropic fields generated by the migratory Hrud swarms caused stone to age and brought flesh to ruin, turning the Astartes warriors into so much dust and bones, rusting their armour and jamming their Bolters as the Iron Warriors' fortress crumbled all about them. Only then did the rachidian beasts creep out of every nook and crevice to attack, stabbing and slicing with their venomous claws. This left Warsmith Dantioch prematurely aged and crippled. Very few survivors made it out alive as Stormbirds extracted the survivors from the remains of Gholgis. Many of the Astartes died from premature aging or were left in aged, superhuman bodies. In the Hrud Migration's aftermath, the worlds of Krak Fiorina, Stratopolae and Gholghis were lost. The Warsmith questioned Primarch Perturabo's prosecution of the Hrud extermination campaign, which left half a Grand Company dead. Dantioch soon found himself relieved from command of the 51st Expeditionary Fleet and permanently garrisoned to the world of Lesser Damantyne for his presumption.
Cleansing of Arigatta This was an Imperial Compliance that was carried out jointly by the Sons of Horus, Ultramarines and the World Eaters Legions against the world of Ariggata. When Imperial envoys arrived bearing word of the Emperor and the Imperial Truth, they were executed in a bloody gesture of independence. Most of the planet was quickly conquered, except for the massive fortress within which most of the leaders of the planet cowered. Eager to be on his way, Horus commanded Angron, Primarch of the World Eaters, to take the citadel and kill only the leaders. Eagerly, Angron led the assault. However, the fortress was heavily defended and the casualties were horrendous, a dozen World Eaters falling for every metre of land. Eventually, a ramp of corpses led up to a single breach in the wall, and the Astartes of the World Eaters Legion plunged in and slaughtered all remaining survivors, transforming the fortress into an abattoir of blood. Before Guilliman was able to confront his brother Primarchs regarding the massacre on Ariggata, the Horus Heresy erupted, both Horus and Angron spitting on their oaths of loyalty to the Emperor, and Guilliman's worst fears were confirmed.
004-005.M31 The Razing of Prospero Magnus the Red, Primarch of the Thousand Sons, learns of his Horus's fall and attempts to warn the Emperor using psychic arts forbidden by the Edict of Nikaea. He inadvertently unmakes his father's great work, destroying the psychic wards around the Imperial Palace and breaching the Imperial Webway gate by allowing a Warp rift to open up within the dungeons of the palace. The Space Wolves are ordered to bring him to answer. While enroute to Prospero, the Warmaster intervenes and convinces his brother Leman Russ that Magnus' crime is so dire, his life is forfeit. The Space Wolves raze Prospero to ashes, and while Magnus escapes, his Legion is reduced to but a thousand warriors.
004-007.M31 Purgation of Arkenath An Ultramarines contingent comprised of five-hundred Legionaries participate in a three-year long campaign against the Vektate xenos overmind, to free the human population of Arkenath
004-009.M31 Signus Cluster Campaign he bulk of the Blood Angels Legion is dispatched to the distant Signus Cluster to put down a local uprising. Knowing the IX Legion will never join his cause and fearing their Primarch, Horus sets his trap at Signus Prime, where the Blood Angels are beset by a foe none have ever faced before, the Daemon legions of the Ruinous Powers, and assailed by terrifying psychic assaults and distortions of reality.
005.M31 The Jorgall Execution The Jorgall campaign was carried out during the Great Crusade against a xenos race of humanoid aliens known as the Jorgall. Many of these xenos featured extensive cybernetic physical enhancements to improve their physical forms and enhance their fighting abilities. Elements of the Sisters of Silence, alongside the 1st, 2nd and 7th Great Companies with Mortarion as the commander, launched an assault into the main Jorgall cylinder world. penetrated the drive cluster and took out the control of the cylinder world's motive power centre. Battle-Captain Nathaniel Garro, alongside an elite cadre from the Sisters of Silence, neutralised the construct's hatcheries. Following their hard-fought victory, there were dissenting voices from the Mechanicum contingent who petitioned Mortarion for a few days in which to loot the alien craft of technology. The Primarch, as was his prerogative, refused the request, as the letter of Malcador the Sigillite's orders -- and therefore, by extension, those of the Emperor Himself -- was that the Jorgall incursion into the sector was to be exterminated and nothing more.
005.M31 Battle of Istvaan Extremis The elite 1st Company of the Emperor's Children Legion fought in concert with the Death Guard Legion's 7th Battle-Company, under the command of Battle-Captain Nathaniel Garro, against traitorous forces on Istvaan Extremis, the outermost planet within the Istvaan System. Whilst fighting against a powerful Slaaneshi psyker known as a Warsinger, Garro sustained serious injuries; crushing damage to his torso and arm as well as the loss of his right leg from the mid-thigh down. He was only saved from certain death by the timely ministrations of the Emperor's Children's Chief Apothecary Fabius. Taking stock of the desperate situation, the Emperor's Children Lord Commander Eidolon made use of a hitherto unknown ability -- a modified tracheal implant bonded with the Lord Commander's vocal chords, that allowed him to produce a nerve paralysing shriek similar to that employed by certain warrior breeds of the xenos Laer. This powerful ability killed the Warsinger and helped the Astartes carry the day.
005-006.M31 Istvaan III Atrocity Horus musters four entire Legiones Atartes (his own Sons of Horus, Emperor's Children, World Eaters and World Eaters) to put down rebellion at Istvaan III, and having turned their Primarchs to his treacherous cause, engineers the purging of tens of thousands of Loyalist Legionaries not trusted to follow them. All does not go to plan however and a small number of Loyalists escape the carnage to carry word of the Traitors' actions to Terra.
005.M31 Flight of the Eisenstein Nathaniel Garro, Battle-Captain of the Death Guard's 7th Great Company, flees Istvaan III after having witnessed the Warmaster's treachery first-hand. He braves the Warp to escape the Traitor forces who pursue him in order to bring word to the Emperor of his former favoured-son's duplicity. He encounters Primarch Rogal Dorn and his Imperial Fists and informs him of the events of the Istvaan III Atrocity. Lord Dorn brings Nathaniel Garro to the Somnus Citadel on Luna, home of the Sisters of Silence. Garro is later brought to the Regent of Terra, Malcador the Sigillite and recounts his tale of woe. The Imperium begins to fortify itself against the inevitable attack of Traitor Legions. Nathaniel Garro becomes Agentia Primus of Malcandor's newly formed Knights-Errant.
005-006.M31 Schism of Mars Fabricator-General of the Mechanicum Kelbor-Hal turns against the Imperium and plunges Mars into civil war. Those loyal to Terra are forced to abandon the Red Planet. Elsewhere, the Schism of Mars sunders the feudal order of the Mechanicum and its bonds with the Imperium, many Forge Worlds side with the Traitors, others with the Emperor and still others declare independence from either side. So likewise are the Titan Legions, the Skitarii legions and the powerful Taghmata riven with division.
005.M31 Battle of Diamat When word reaches the Dark Angels of the Istvaan III Atrocity, Lion El'Jonson and the I Legion are bogged down fighting a campaign against the Gordian League. Therefore, the Lion leads a small war fleet of 16 vessels against the Forge World of Diamat, in order to seize Ordinatii heavy siege engines, and deny them to the Traitors. He encounters some resistance from vessels loyal to the Traitor cause, as well as traitor Imperial Army forces and Sons of Horus Company on the planet's surface. The Lion orders the destruction of the planet's primary forges, which annihilates the Traitor forces in a great conflagration and denies Horus, Diamat's manufacturing abilities. In the battles aftermath, the Lion encounters the Iron Warriors fleet, led by Perturabo, who are on their way to Istvaan V to 'pacify' the treacherous Warmaster. Unaware of their true loyalties, the Lion unwittingly hands over the captured Ordinatii to be used against Horus.
566.006.M31 Dropsite Massacre of Istvaan V With Terra warned of the Warmaster's treachery at Istvaan III, eight entire Legions are ordered by Terra to crush the Traitors' rebellion, but unbeknownst to the Iron Hands, Salamanders and Raven Guard, Horus has already turned three of them (the Night Lords, Word Bearers and Alpha Legion) and ensured the fourth (Imperial Fists) is delayed. The first wave makes planetfall but is betrayed by the second follow-on wave, and in the bloodiest three hours of war ever fought by the Legiones Astartes, three Legions are almost entirely wiped out, one Primarch slain (Ferrus Manus) and two others lost.
ca. 006-009.M31 Imprisonment of Vulkan Salamanders Primarch Vulkan managed to survive the nucleonic bombardment of the Urgall Depression, due to his unknown regenerative abilities as an immortal Perpetual. When he finally awoke in the aftermath of the explosion, he found himself surrounded by hundreds of Iron Warriors and Night Lords Legionaries. Prepared to fight to the death, the Traitor legionaries proceeded to shoot, stab and bludgeon the Primarch into unconsciousness. Seeing the opportunity to torment his brother, Konrad Curze took Vulkan prisoner, and secured him aboard his flagship Nightfall. Over a period of several years, Curze would proceed to torture Vulkan mercilessly in an attempt to break his body, mind and spirit. But eventually, Vulkan effected his escape, and with his warhammer, Dawnbringer, was able to teleport himself to the upper orbit above the capital world of the Realms of Ultramar -- Macragge. Before burning up in the plaent's atmosphere upon reentry, he was confident that he would wake up in the care of his cousins.
ca. 006.M31 Battle of Ravendelve Following the calamitous events of Istvaan V and the Raven Guard's flight to Terra to bring word of the disaster, the shattered XIX Legion returned to their home world of Deliverance. Unknown to them, the insidious Alpha Legion had inserted several of their own Legionaries, surgically disguised as Raven Guard Legionaries who had died on the black sands of Istvaan V. Gathering intelligence on Primarch Corax' efforts to reconstitute his Legion utilising a sample of pure Primarch DNA given to him by the Emperor Himself, the Alpha Legion operatives patiently waited until the Raven Guard had achieved a genetic breakthrough. In the meantime, they fomented rebellion amongst the old tech-guilds of Kiavahr, the Forge World that the moon of Deliverance circled, while assembling Alpha Legion forces nearby, for an unsuspected surgical strike. The Alpha Legion successfully tainted the Primarch DNA, which resulted in the disastrous mutation of newly inducted Raven Guard aspirants into hideously transformed creatures. At the same time, the Alpha Legion's plans reached their climax. The Kiavahr rebellion was well under way, supported by the newly arrived Alpha Legion forces, who were camouflaged as Raven Guard. The Loyalist Raven Guard successfully put down the rebellion and killed all the Alpha Legion operatives.
The First Battle of Paramar Alpha Legion forces allied with the Traitor Dark Mechanicum of Taghmata Satarael and the Titans of the Legio Fureans mount a surprise attack on the strategically vital lynchpin system of Paramar before their true allegiance becomes known to the defenders. Paramar is a vast arms cache of the Great Crusade and a vital communications hub. The Pharaeon of Paramar, its primary void station, is quickly taken, but a full planetary assault of Paramar V becomes necessary as Loyalist Mechanicum and Legio Gryphonicus Titan forces, as well as the unexpected intervention of a Loyalist cadre of the Iron Warriors Legion, offers the invaders strong resistance. The valiant defence however is overwhelmed and Paramar falls to the Traitors, cutting off much of the most stable transit routes to the northern Imperium.
The Sundering of Zhao-Arkad
Battle of Lesser Damantyne When Warsmith Krendl arrives at Lesser Damantyne with the Iron Warriors 51st Expeditionary Fleet to secure the formidable fortress, known as the Schadenhold, as a resupply point for the Warmaster's Traitor Legions, it's Loyalist Iron Warriors commander, Warsmith Barabas Dantioch refuses to comply. This results in an internecine conflict between the two opposing Iron Warriors forces. Dantioch commanded his meagre forces against the entire might of the 51st Expeditionary Fleet and the 14th Grand Company of the Iron Warriors for 366 standard days, until the Traitors deployed an Imperator-class Titan to destroy the Schadenhold. Though the fortress falls, Dantioch and the surviving Loyalist Iron Warriors teleport aboard the Traitor's flagship and commandeer it, and flee towards Terra.
007.M31 Raid on Cruciax The Raid on Cruciax, which harboured a listening post of the Word Bearers Legion marked the Raven Guard's return to the battlefield after the crippling losses suffered during the Dropsite Massacre. Intended as a field test to further assess the capabilities and discipline of the new contingent of the XIX Legion, the Raptors, the raid was a full success, wiping-out the Word Bearers garrison and destroying the facility in less than twenty minutes. The first three hundred members of the Raptors, which were all genetically perfect, were declared battle-ready following this action and the Raven Guard quickly put its eye on a more important target -- the Siege of the Perfect Fortress on the world of Narsis.
Siege of the Perfect Fortress Located on the world of Narsis, the so-called "Perfect Fortress" had been erected by the III Legion, the Emperor's Children during the Great Crusade-era. Following the Legion's catastrophic losses and the ill-fated attempt to quickly replace these losses, Corvus Corax decided that his Legion would assail the highly symbolic location. Through Corax's superlative military tactics and stratagems, the so-called "Perfect Fortress" falls within the day. This highly symbolic action not only marked a severe defeat for the notorious Traitor III Legion, but also the return of the XIX Legion to the front lines. It was purely an act of spite against Horus, and even though it nearly brought it to extinction, the Raven Guard would still opposed him and proved to be a thorn in the Traitor's side.
First Siege of Hydra Cordatus Shortly after the disastrous events of the Drop Site Massacre of Istvaan V had played out to their tragic conclusion, the traitorous Iron Warriors Legion saw the opportunity to humble their hated rivals, the Imperial Fists, upon the isolated world of Hydra Cordatus. The Iron Warriors make planetfall and proceed to be held at bay for nearly three months, thanks to the courage of its defenders, the geography and the ingenuity of the fortress builders of the Cadmean Citadel. The few surviving Imperial Fists defenders were slaughtered to a man and the surviving refugees were enslaved by the Iron Warriors before they moved on to their next objective. Hydra Cordatus was reduced to a barren desert world by the Traitor Legion's assault.
Battle of Phall Having been cut off course and stymied by warp storms enroute to Istvaan V by the machinations of the Warmaster's dark allies, the Imperial Fists retribution fleet is becalmed for long months at the Phall System. Only by maintaining a constant state of readiness and the genius of their commander is the fleet saved from the utter destruction when the Traitor Iron Warriors attack. At the height of the engagement, a message from Terra finally breaks through the turbulent Warp, the Primarch of the Imperial Fists ordering his fleet to return to Terra at once.
The Angel Exterminatus Both the Iron Warriors and Emperor's Children enter the great Warp rift, named by Perturabo as the 'Eye of Terror', on a quest to seek out an ancient Eldar weapon known as the Angel Exterminatus. They are led deep within this hellish, where they discover the remnants of an Eldar Crone World. While exploring the planet's ruins, they are set upon by guardian Ghost Warriors and other Eldar Wraith constructs. Unknowingly, Fulgrim had been using his brother in order to finally achieve apotheosis, and thus, he becomes the first Primarch to ascend to Daemonhood.
007-009.M31 The Shadow Crusade The Word Bearers and World Eaters invade the Five-Hundred Worlds of Ultramar with the aim of utterly destroying the domain of the Ultramarines and drawing Loyalist forces away from the Warmaster's advance on Terra. During the conflict, which centres around the perfidious attack of the Word Bearers at the Calth Muster, scores of worlds are ravaged and the involvement of the Ruinous Powers in aid of the Traitor cause is first widely manifest in open war, transfiguring both of the Traitor Legions involved.
The Manachean War & the Dark Compliances His treachery revealed at last, the Warmaster begins his relentless advance on Terra, forcing his Dark Compliance of countless regions across the northern Imperium to provide his forces with a resource base to fight what will now become a protracted and relentless war. Foremost among his targets are the Manachean Commonwealth, the Coronid Deeps and their surrounding regions, where a particularly savage campaign is conducted by the Sons of Horus and Death Guard which brings the economically vital worlds of the Manachean Commonwealth to fuel the Traitors' cause. This wider campaign also places the fleet anchorage of Port Maw under the Warmaster's talon and sees the stubbornly Loyalist Forge Worlds of Lucius and Mezoa isolated and besieged, while the Traitor-aligned Forge World of Cyclothrathe begins to carve out its own pocket empire in the region.
007.M31 Destruction of the Furious Abyss Following the destruction of the Auretian Techocracy and the securing of their rare STC templates, Lorgar, Primarch of the Word Bearers secured a secret alliance with the traitorous Fabricator-General Kelbor-Hal. He commissioned the Dark Mechancium to construct a triumvirate of mighty vessels built for the service of his Legion. The Furious Abyss was the first such vessel of its kind. The Word Bearers had been secretly ordered by the rebellious Warmaster Horus to bring their unfettered wrath down upon their hated rivals, the Ultramarines Legion. The Furious Abyss was to play an instrumental role in the Battle of Calth and the Traitor Legion's destructive campaign that would see the Ultramarines capital world of Macragge destroyed. But before the mighty ship could reach its destination, the secret of its existence had been discovered. The Word Bearers' vessel was secretly infiltrated by a small ad-hoc Loyalist strike force of Space Marine Legionaries, who proceeded to sabotage the ship's plasma generatorium, which began a chain-reaction that resulted in the destruction of the massive vessel.
007.M31 The Calth Conjunction and Calth Atrocity Mustering at Calth on orders issued by the Warmaster before Istvaan, the Ultramarines and Word Bearers prepare for a campaign against the Orks of the Ghaslakh xeno-hold. The Ultramarines are unaware of the Word Bearers' true allegiance and utterly unprepared for betrayal, and suffer horrific losses. The Traitors' real objective is the murder of the Veridia star as an offering to the Ruinous Powers that would bring about the Ruinstorm, a warp tempest so large, it would sever the galaxy in half and render all long-range Warp travel unpredictably dangerous, and trans-luminal communication all but impossible. The Age of Darkness begins.
007-017.M31 The Underworld War on Calth Following the events of the Calth Atrocity, the Word Bearers perform one last act of spite and cause the planet's primary star to go super-nova. The surface of Calth is ravaged by the slow death of the Veridia star. The Battle for Calth between trapped forces of those Ultramarines and Word Bearers still locked in a death-struggle descends into the extensive arcologies. The Underworld War grinds on for ten years before the last of the Traitors is finally hunted down and slain.
570.007.M31 Return of Cassian Dracos Still ignorant of the events that occurred on Istvaan V, Lord Chaplain Nomus Rhy'tan despatches Chaplain-Lieutenant Xiaphas Jurr and 30 Firedrakes aboard the Ebon Drake to ascertain the fate of their Legion. When the Ebon Drake arrived to the black sands of Istvaan V, they were unable to locate their missing Primarch, but they were able uncover the battered shell of the Dragon Revenant, far from intact but not yet willing to surrender to his final inevitable death. Called "The Twice-Dead" and the "Avatar of the Sacred Flames" by his brothers, Cassian Dracos returned to the battlefields of the Imperium to enact his vengeance, but he would not be as once he was. His time beneath the black, blood soaked sands of Istvaan V had left him changed, fey and of unpredictable temper and able to exert a disturbing control over the creations of the Machine God and those bound to them. The presence of Cassian Dracos reinvigorated the demoralised crew of the Ebon Drake, and they continued their search for their missing Primarch, convinced that he yet lived.
007.M31 The Wolf & The Khan The White Scars learn of the Warmaster's heresy when they establish contact with Leman Russ in the aftermath of the Space Wolves' destruction of Prospero. Faced with the dilemma of aiding the weakened Space Wolves against a powerful force of Alpha Legion attackers, or returning to Terra as ordered by Rogal Dorn, Jaghatai Khan chooses a third option. Seeking out answers for himself, he orders his fleet to set course for Prospero to ascertain what has occurred there.
007.M31 Battle of the Alaxxes Nebula As the Space Wolves are still licking their wounds following their heavy losses during the Razing of Prospero, they are ambushed by a sizable Alpha Legion strike force and are subsequently routed at Yarant. Primarch Leman Russ organises a tactical retreat and flees towards the Alaxxes Nebula. The Alpha Legion gives chase and soon the VI Legion finds themselves in a precarious predicament -- they are effectively cut-off and surrounded. Though Russ reluctantly sends an distress call for assistance to his brother-Primarch Jaghatai Khan, of the White Scars Legion. The Khagan declines to assist the Space Wolves and instead sets course for Prospero to determine the truth for himself in regards to the Warmaster's heresy. The Space Wolves are eventually forced to flee in order to survive. A final confrontation eventually erupts between the Loyalist and Traitor forces as the Space Wolves vow to take as many of their foes with them before they are annihilated. The Sons of Russ receive relief from an unexpected quarter, in the form of the Dark Angels Legion, and their mighty Star Fort, the Chimaera. Answering Russ' distress signal, the combined force of Loyalists are able to turn the tide, and inflict serious losses on the Alpha Legion, and force them to withdraw.
007.M31 Second Battle of Prospero After Jaghatai Khan refuses to aid Leman Russ and his battered Space Wolves fleet, he finally arrives to the ravaged world of Prospero seeking answers for himself. Teleporting down to the planet's surface with a small Honour Guard detachment, Jaghatai explores the ruins of the planet's former capital of Tizca. During his explorations, the Primarch becomes separated, and soon finds himself within a network of subterranean caverns, where he is confronted by the ætherial projection of his brother Primarch Magnus the Red. Magnus implores his brother to choose a side and to not trust their father, the Emperor. Finding the answers he sought, Jaghatai made his way towards the surface and is reunited with his Keshig, who are soon beset by Mortarion and a contingent of Deathshroud Terminators. The Death Guard Primarch tries to persuade his brother to join the Warmaster's cause, but Jhagatai refuses, and proceeds to fight his brother, gravely wounding him and forcing him to withdraw. Teleporting back aboard his flagship, the Primarch then orders his fleet to depart for Terra.
007-009 Thramas Crusade Horus orders the Traitor Primarch Konrad Curze of the Night Lords to neutralise the three Forge Worlds of Thramas, thereby denying the Loyalists a major source of war machines and materiel in the eastern Imperium. They succeed in destroying two of the region's Forge Worlds and wounding the third grievously.
007-011 The Path of Heaven Trapped far from Terra, the massive Warp Storm known as the Ruinstorm, making all long-distance Warp travel impossible. Seeing no other choice, the White Scars are forced to begin hit-and-run guerilla campaign against the Traitor Legion forces to slow their advance on the Throneworld. The White Scars proceed to lose nearly one-fifth of their fighting forces over the course of the next few years. As the Traitors adjusted to the V Legion's tactics, it became apparent to Jaghatai Khan that they were slowly being boxed in. Desperately, the White Scars seek out one last approach, and discover a hidden Navigator facility within the Catallus Warp Rift. Within they find the Dark Glass artefact -- a far-less powerful prototype of the Emperor's own Golden Throne device, which was capable of accessing the Webway. The White Scars Stormseer, Targutai Yesugai sacrificed himself, when he sat upon the Dark Glass throne in order to open a temporary path through the Webway, which allowed the White Scars to escape from a massive Traitor fleet, and exiting at the outer edge of the Segmentum Solar.
004.008.M31 The Battle of Percepton Primus A large Word Bearers contingent of the 34th Company, led by Captain Sor Talgron and Dark Apostle Jarulek, assaulted the world of Percepton Primus located in the Percepton System of Ultramar at the beginning of the Shadow Crusade. They manage to cripple the defending Ultramarines fleet in 27 minutes, destroying nearly half their fleet, but the fight would continue on the ground, as the Ultramarines stubbornly hold out for another 163 days, led by the Ultramarines 17th Chapter Master Aecus Decimus. In the final desperate hours of the campaign, the Ultramarines utilised Phosphex, a world killing weapon that Guilliman abhorred using, in order to achieve victory, though the planet was rendered a burnt cinder and uninhabitable to life. Though they were able to kill two-thirds of the Word Bearers' forces, both Talgron and Jarulek escaped the burning surface of Percepton Primus.
008.M31 The Raven Strikes The Raven Guard proceed to conduct a protracted campaign against the Traitor Legions and manage to secure multiple victories at Scarato, Kapel-5642A, Constanix II and Carandiru.
Battle of Perditus When the Dark Angels receive intelligence from an Astropathic message from the nearby Perditus System, they act accordingly and move to intercept. Upon arrival, they interrupted the month-long conflict between the Iron Hands 98th Clan-Company, led by Casalir Lorramech and a large Death Guard contingent, led by First Captain Calas Typhon. Both sides had been fighting over an ancient sentient device, known as the Tuchulcha Engine. This device was a part of a triumvirate of similar sentient devices (another being the Ouroboros and a third, unnamed engine) which when combined could create temporal rifts that bridges space and time. On its own, the Tuchulcha was capable of precise and extremely efficient Warp jumps. Faced with the prospect of fighting the entirety of the much larger I Legion fleet, both sides retreated from the planet's surface at the Lion's request. Wary of both sides' motives, especially First Captain Typhon's, the Lion prevented the device from falling into the Death Guard's hands for his own nefarious ends. He then proceeded to serve his own ambitions and requisitioned the device for his own use. The Lion then ordered the destruction of Perditus, much to the consternation of both commanders.
Blood among the Pale Stars A previously unidentified Blackshields group of unknown provenance, calling itself the Dark Brotherhood, carves out its own corsair empire on the edge of the Pale Stars and begins a long war against an Alpha Legion hunter-killer force tasked with crushing resistance to the Warmaster's Dark Compliance.
The Destruction of Bodt The World Eaters' fief world and Legiones Astartes training ground on Bodt is attacked by the infamous Iron-Father Autek Mor of the Iron Hands and an allied independent Loyalist force. After a savage battle, Mor is believed to have entered the subterranean macro-vaults of the city of Tredecimmia before scouring every trace of life from the surface. Bodt's supply line of initiate recruits to the World Eaters Legion is permanently severed.
The Burning Grave of Ohmn-Mat The Forge World of Ohmn-Mat in the Ultima Segmentum falls into a state of civil war as its Synod Magos are split in their support for Loyalist and Traitor causes, drawing in contingents of Sons of Horus Dark Compliance forces and Iron Hands Istvaan survivors as the conflict escalates. Ohmn-Mat is destroyed in the conflagration and its fires still rage till the present.
Fall of Batzel III A Space Wolves strike forces eradicate the entire 39th Millennial of the Emperor's Children during the storming of the Vykstag Winter Palace as part of the Batzel III Campaign for control of the Brozyn-Primaris sector of the Segmentum Obscurus. Leaderless, Batzel succumbs to infighting and ultimately genocidal civil war. While exiting the sector, the Space Wolves strike force clashes inconclusively with an unknown and elusive Legiones Astartes force which bears no recognisable heraldry.
The Blight of Isessos A series of void raids on the outskirts of the Isessos System in the Segmentum Pacificus by an Alpha Legion strike group leads to severe casualties, which are returned to the colony habitats of the system's three Agri-Worlds for treatment. Several of the casualties are later found to have been infected with an unknown algal strain. Within a year this virus wipes out the system's vast macro-output saturation fields, reducing them to poisonous slime. This results in a sector-wide famine that killed an estimated ninety billion Imperial citizens and the complete political destabilisation of the region.
The Dagonet Incident The hidden clade-masters of Terra dispatch their most potent assassins to the recently fallen world of Dagonet in an attempt to strike down the Warmaster. They are unsuccessful, but from their failure Terra learns much of the new and dreadful powers wielded by its foe.
008-009.M31 The Vannaheim Space Drop The Iron Warriors launch a daring void assault against the orbital hives of Vannaheim, capturing vital facilities after ten days of brutal fighting. A Loyalist force in the Segmentum Tempestus, including isolated elements of the Space Wolves Legion is, is drawn into the conflict, launching three successive counter-assaults in order to recapture the orbital hive stations' vital altitudinal control grid, but each fails to achieve its goal and countless thousands of Loyalist lives are lost. The fame Space Wolves grand cruiser, Helicon Spear, is captured and becomes a prize of the Iron Warriors Legion during the last, disastrous attempt.
009.M31 The Tsagualsa Incident Forces of the Dark Angels Legion ambush the Night Lords at Tsagualsa, inflicting severe losses. Lion El'Jonson of the Dark Angels and the Night Haunter clash in direct contest of arms after a failed parley, and both are so grievously wounded that their warriors are forced to drag them clear of each other before the matter can be settled.
The Defence of Nagathar Severed from the main body of their Legion by the unleashing of the Ruinstorm, a strike force from the Dark Angels Legion finds shelter in the Nagathar-system which had become a safe haven for several Loyalist splinter forces, the most important being drawn from the Imperial Fists. The many Loyalist fractions banded together to defend Nagathar from a powerful incursion led the Word Bearers, which had hoped to prey on the system's millions inhabitants to fuel yet another of their sorcerous rites.
Xana Incursion Intelligence reaches Terra that the renegade Forge World of Xana II on the western fringe of the Imperium has reached an accord with the Traitor forces to supply the Warmaster's armies with its vast output of arms and materiel. The bargain is sealed with the delivery by Xana of a number of newly created powerful Ordinatus class weapons undergoing final field tests. In what is effectively a suicide mission, a handpicked force of Legiones Astartes, including many Blackshields -- in this case Space Marines who have chosen to remain loyal despite their parent Legion's treachery -- is despatched under great secrecy to destroy the war machines and drive a wedge between Xana and the Traitors.
Defence of Coronis Agathon When the Parliament of Electors of the world of Coronis Agathon, captial world of the Agathean Domain erupt into arguments over whether or not to stay loyal to the Emperor or ally with the Warmaster Horus, Ireton MaSade, the old former Lord Mashal Militant, nearly two centuries in age and retired from public life, and all but a recluse for nearly two decades, interrupts the warring chamber. Bedecked in his old livery of his Solar Auxilia regiment and flanked by troops of the Solar Auxilia Veletaris, MaSade confronts the weak-willed politicians and denounced them for their moral weakness, and declared them all traitors to the Emperor. Before the lords of Agathon can reply or protest, the funeral guard turn their volkites on the nobles of the parliament and burned them to ash. Agathon and the worlds around it are placed under martial law under direct control of the "Old Guard" of the 60th Expeditionary Fleet and its direct descendants. Agathon is placed on a war footing, intent on having their vengeance against the Traitors.
The Battle of Arissak Having pursued the numerous attack cells made up of Iron Hands, Salamanders and Raven Guard survivors of Istvaan V, Captain Tybalt Marr of the Sons of Horus finally brings them to battle, destroying the massed fleet of Shadrak Meduson's so-called "Shattered Legions" force at Arissak.
The Incident at Dwell Horus arrives upon the world of Dwell, a world settled during the Dark Age of Technology by settlers from the nearby Knight World of Molech. The Warmaster was intent upon utilising the ancient repository on Dwell that contained information that would lead him in search of the Emperor's power back to Molech, where he had unknowingly taken part in that plaent's Imperial Compliance campaign decades earlier, and had his memories suppressed by the Emperor. Shortly after the infamous campaign on Istvaan V, the Sons of Horus were also forced to recoup their losses. Having escaped death at Arissak, one of Shadrak Meduson's surviving Shattered Legion attack cells launches a daring assassination attempt on Warmaster Horus at Dwell. With his brother-Primarchs Fulgrim and Mortarion at his side, Horus prevails, but having had the true threat revealed to him grants Tybalt Marr permission to take any action he deems appropriate to eradicate the remnants of the so-called "Shattered Legions".
Battle of Molech Horus leads both the Sons of Horus and the Death Guard Legions in the invasion of the Fortress World of Molech. Having recovered some of his memories in regards to the earlier campaign that took place decades earlier, Horus uncovers the truth about the hidden subterranean Warp portal that leads into the Realm of Chaos. Wanting this power for himself, he launches a massive strike on the unsuspecting world. During the height of the conflict, the Imperial Knight House Devine turns against the Imperium and joins the invading forces, betraying the defenders to their deaths. A force of the elite Knights-Errant, a secretly founded Order of Loyalist agents, are dispatched to Molech by Malcador the Sigillite to prepare the way for a direct assault by the Space Wolves against the Warmaster's flagship. Having recently won the full blessings of the Ruinous Powers, Horus is undefeatable and only a handful of Knights-Errant escape to bring news of his redoubled strength back to Terra.
The Sangraal Campaign & the Salvation Run A hand-picked Imperial Fists assault force despatched from Terra launches a daring raid to capture the antidote to a slow-burning Exterminatus-class viral weapon deployed against the Loyalist holdfast of Gramercie on the contested Hive World of Herkaliaum. After recovering the antidote stocks from the Traitor Mechanicum-Bioligis gene-labs, the heavily outnumbered Imperial Fists then fight their way through massed Traitor forces, running a deadly gauntlet through the underhives of Herkaliaum to deliver the antidote to Loyalist medicae detachments, thus saving the population of the Gramercie sub-hive. Viral overspill ravages the Traitor forces now unable to contain or cure the contagion in their own ranks, and within weeks, Herkaliaum is liberated. The legend of the "Salvation Run" becomes a rallying cry for Loyalist support in the sector, turning the Sangraal Campaign in the Loyalists' favour and cementing their hold on the Segmentum Solar.
The Establishment of the Imperium Secundus With the Imperium severed in two halves, isolated and ignorant of each other as a result of the raging tumult of the Ruinstorm, the light of the Astronomican is no longer visible from Ultramar and no word of the Emperor has been heard for several years. Ultramarines Primarch Roboute Guilliman declares the foundation of the "Imperium Secundus" as a means of continuing the fight against the Traitors and securing the Emperor's great work. When the Blood Angels arrive at Ultramar having escaped the Signus Cluster, Guilliman proclaims Sanguinius as the rightful heir to the Emperor.
[Extract sanctioned for data purge]
Battle of Sotha Upon the far-flung world of Sotha, which lay close to the edge of the galaxy's Eastern Fringe, almost at the limits of both the fiefdom of the Five-Hundred Worlds of Ultramar and the span of all Imperial territory. Upon this world the Ultramarines had discovered beneath its tallest peak, named Mount Pharos, a massive aperture constructed by an unknown xenos species. This device functioned both as a beacon and route-finder, and it also permitted instantaneous communication across unimaginable distances, even penetrating the raging tumult of the Ruinstorm. Following their defeat at the hands of the Dark Angels at Tsagualsa, remnants of the Night Lords Legion followed this beacon in the warp, which guides them safely to the world of Sotha. Over many months, the Night Lords secretly gather intelligence on the suspicious activities of the Ultramarines, and soon discover the nature of the arcane device, named the Pharos, upon the restricted planet. The Night Lords launched a surprise assault upon the lightly garrisoned world, intent on seizing the Pharos in order to use it to determine the location of their flagship, the Nightfall, as well as the whereabouts of their missing Primarch Konrad Curze. In the ensuing battle, the loyalist Iron Warriors Warsmith Barabas Dantioch, sacrifices himself by overloading the Pharos, so that the Night Lords would be unable to utilise the device's powerful empathic abilities. What far reaching consequences this will have for the galaxy, will not come to pass for another ten millennia.
Vulkan Lives Vulkan's charred remains were later recovered by the Ultramarines, who initially assumed the massive corpse was some kind of grotesque statues. But over the following days, Vulkan's body began to regenerate, and eventually life returned to it. Vulkan was in a mentally unstable state, and was violent and incoherent. This was due to the perverse bond that had formed between Vulkan and Curze during the months he had been continuously tortured and killed while being a prisoner aboard the Nightfall. Vulkan reacted violently, as he could sense the presence of Curze nearby. With the recent arrival of the Dark Angels, Curze had been taking refuge in the bowels of their flagship, following the Night Lords defeat at Tsagualsa. Causing as much murder and chaos as possible after escaping to the surface of Macragge, Vulkan eventually broke his bonds, and began hunting down the Night Haunter. They battled across Macragge's capital city, until they were confronted by the Perpetual John Grammaticus, who used the Fulgurite, a petrified piece of the Emperor's psychic power, and stabbed the heart of the Vulkan, which seemingly killed him. This time however, Vulkan did not recover. In the battle's aftermath, Curze effected his escap. Vulkan was laid in stasis within a stasis-sarcophagus, hand-crafted by Guilliman himself, with the words Unbound Flame engraved on its side.
Rebirth of Vulkan Following the death of their Primarch, Salamanders Shattered Legion survivors of Istvaan V, who had also been drawn to Macragge by the empathic beacon of the alien artefact known as the Pharos, were allowed to stand vigil over their fallen Primarch's casket. Their surviving First Captain Artellus Numeon was convinced that Vulkan yet lived, and eventually took his Primarch's body on an arduous expedition back to their home world of Nocturne. He was convinced that if Vulkan's body were lowered into the cleansing fire of the Unbound Flame of Mount Deathfire, he would be restored to life once again. The Salamanders vessel was pursued by a large Traitor fleet consisting of both Death Guard and Word Bearers, whose commanders both had their own personal reasons for acquiring Vulkan's body. Miraculously, the Salamanders found their way through the turbulent Ruinstorm, and arrived at their home world of Nocturne, and were greeted by Nomus Rhy'tan, Lord Chaplain of the XVIII Legion and Keeper of the Keys of Prometheus. A battle ensued between the Traitor and Loyalist forces, in which the Salamanders eventually emerged victorious. Following this victory, the Salamanders conducted the burial rites of Vulkan, and returned their Primarch's body to the fires of Mount Deathfire, in the hopes that Vulkan would be resurrected. After over a week of waiting, this turn of events sufficiently broke Numeon's spirit. As the next Time of Trials drew near, Numeon renounced his rank and position. He then wandered away into the burning ash wastes around Mount Deathfire and offered himself as a final sacrifice so that his father and Primarch could be restored.
009-053.M31 The Carnage of Morox In one of the largest confrontations between Loyalist and Traitor-aligned auxilia and militia forces, in excess of three billion battlefield fatalities are recorded as the death toll from a grinding war of attrition on the sector-capital world of Morox Excellus. The Morox civil war takes place in almost total isolation owing to turbulent Warp Storm activity and lack of any real strategic significance to either side of the wider conflict, and is noted for the exponentially increasing levels of atrocity and rapid technological regression of the conflict.
010-015.M31 The Solar Wars The Battle for the Sol System, long threatened, begins as infiltration forces and probing raids from without, and Mechanicum attacks and attempted break-outs from besieged Traitor Mars test the defences of the Throneworld of humanity. Conflict within the system is not concluded until the eventual lifting of the Siege of Terra.
{See Extrapolation Addenda CVX-CVXVIII-Classified Amaranth-Gold}
010.M31 Battle of Pluto The Alpha Legion carries out multiple diversionary attacks of sabotage and preparation, which plunges the Sol System into complete chaos. Their true target however, is the fortress moon of Hydra, which orbits Pluto. First Captain Sigismund and a small fleet of Imperial Fists stubbornly defend Pluto against the larger Alpha Legion fleet until help arrives, in the form of the Phalanx and a large fleet of Imperial Fists and Armada Imperialis warships. At the height of the battle, Lord Rogal Dorn leads an assault on the fortress moon and confronts his brother Primarch Alpharius and engaged him in melee combat. Alpharius is killed by Dorn, and the Alpha Legion forces are forced to withdraw.
The Scouring of Gilden's Star Scattered elements of the Blood Angels Legion fight a long and bloody campaign against Word Bearers forces near the galactic core on the borders of Imperium Secundus that culminates in the near-total destruction of both armies. During the campaign, the Blood Angels prove merciless in scouring worlds which have embraced the daemonic teaching of the "dark apostles" of the Word Bearers, putting all seven colonised worlds of Gilden's Star to the sword in one particularly notable instance.
The Battle of Nycron Under the direction of Imperial Fists Primarch Rogal Dorn, a Loyalist battlegroup led by elements of the Salamanders Legion, and supported by thirty regiments of the Imperialis Auxilia and a strike force of Legio Astorum Titans, engage an Emperor's Children millennial assigned to garrison the Beta-Garmon System on the edge of the Segmentum Solar. The Emperor's Children contingent is surprised at Nycron City on Beta-Garmon II and after a hard-fought battle, the Emepror's Children forces along with their Legio Mortis allies at Beta-Garmon III are driven out, placing the system into Loyalist hands and triggering within the year the first of an escalating series of Traitor counter-attacks with the goal of retaking Beta-Garmon as a stepping stone for an eventual attack on Terra. Ultimately, these will only serve as a prelude to the far greater conflict in the system to come.
The Dispute of Iron Begins Across the sectors of the Segmentum Tempestus and Segmentum Pacificus are located numerous Forge Worlds known collectively as the Belt of Iron. Since the sundering of the Imperium, many of their number have declared for the Traitor cause at the engineering of the Fabricator-General of Mars, while others have remained loyal to Terra or in some cases sought to remain aloof from the conflict as much as possible. Strife and tentative conflict between these once-aligned worlds erupts finally into full scale war in 010.M31, which pitches the Mars-aligned Forge Words of Incunabula, Urdesh, Valia-Maximal and Kalibrax against the forces of Loyalist Forge Worlds Graia, Arl'yeth and Atar-Median, while Arachnis and Jerulas Station both fall into the anarchy of civil war. The resulting conflict, that later becomes known as the Dispute of Iron, sees the forge lords, their armies and allied Titan Legions and Knight Households turn on each other in protracted warfare, with scores of human-inhabited worlds in the region suffering as they become the battlegrounds upon which they fight.
010-011.M31 Battle of Tallarn Tallarn, an Imperial muster world of almost unparalleled size and importance, comes under direct attack by the Iron Warriors Legion. Here the Traitors unleash a virus bombardment that renders the surface of the verdant world of Tallarn to poisoned slime and the air unbreathable. The invasion that follows develops into the largest armoured battle of the Imperium's history, a war fought under the most hellish conditions imaginable. As the war grinds on, it draws in Loyalist and Traitor forces from hundreds of worlds across the entire Segmentum Tempestus before its cataclysmic conclusion.
010-012.M31 Fate of the Sabalis Liberatus The Sabalis Liberatus, a Raven Guard Legion battlecruiser lost in the Warp since escaping the void battle over Istvaan V, finally breaks into realspace near Galaspar on the borders of the Veiled Region on the southern galactic fringe. The survivors on board, comprising a mixture of Loyalist Legions, have spent the time in self-imposed suspended animation and awoke to find themselves utterly cut off from information or support. Fired on by Imperial patrol vessels whose captains have sided with the Traitors, this "Shattered Legion" force boards the patrol vessels and conquer their attackers. Effecting repairs from the captured ships, they begin a further two-year odyssey of battle to return them to the Segmentum Solar and finally Terra, where they will ultimately fight in the void battles against the Traitor onslaught in the closing days of the war.
011.M31 The Malagant Conflict While surviving Loyalist enclaves apparently crippled by the Warmaster's onslaught, those Death Guard elements assigned to the garrison of Barbarus spearhead an assault into the southern reaches of the Imperium. The grim warriors of Barbarus made the vast industrial hives of Malagant their prime target, a world made valuable for the strategic worth of its manufactoria, and to crush the defiance of the surrounding sectors, many of whom looked to the determined Loyalist leaders of Malagant for leadership. Yet where the Death Guard had expected to crush the Malagantine auxilia in short order, they found themselves mired in cunning ambushes and punishing counter-attacks led by Legiones Astartes bearing the sable mark of the Raven Guard. Lacking the numbers to meet the Traitors head-on, the sons of Corax plied their deadly skills as skirmishers and assassins upon their erstwhile brothers; trapping them on a world they could not afford to abandon, battling a foe they could not pin down and crush. For three years, little more than a company of Raven Guard occupied an augmented chapter of Barbarus' finest, until 014.M31 when the Death Guard retreated in the face of approaching Loyalist reinforcements from Inwit.
Battle of Zepath Obsessed with hunting down the Night Haunter, Dark Angels Primarch Lion El'Jonson eventually is able to trace a slim lead on his former brother's whereabouts to the Zepath System, which had since fallen to the Word Bearers and World Eaters forces. Farith Redloss, the lieutenant-elect of the Dreadwing was charged with leading the hunt for Konrad Curze upon the world of Zepath. The Dark Angels quickly uncovered the horrors perpetrated by the Word Bearers for their dark rituals. Eventually, the Dark Angels took part in multiple engagements against the forces of both Traitor Legions, which culminated in the capital city of Numentis. The Traitor forces were utterly annihilated by the victorious Dark Angels. The world was left in the care of its surviving population.
Scouring of the Nostramo Sector n 017.M31, a Retribution Fleet designated Battlefleet Vengeance, led by the Blood Angels 33rd Company, 9th Chapter, launched a campaign into the Nostramo Sector for further vengeance in their Lord Sanguinius' name, against active Night Lords combat units within the sector. Yet despite all intelligence to the contrary, no determined resistance was to be encountered by these fleets. Of the VIII Legion only scattered and isolated warbands were discovered, and none larger than a reinforced company. They soon uncovered, on multiple, formerly-held Night Lords worlds, evidence that the an unknown Blackshield force had ravaged the Nostramo Sector in 011.M31, leaving nothing but ruined fortresses and drifting battle-scarred wrecks of the VIII Legion in their wake. It wouldn't be until 017.M31, that this mysterious Blackshield would be identified as the mysterious Ashen Claws.
013.M31 A Return to Honour Arcaes Odenathus, a Captain-Praetor of the Ultramarines 10th Chapter, rallies the scattered survivors of his own brethren and those other Loyalist fighting across the Dominion of Storms in the galactic north-east and lead them to Honourum. Unexpected and unlooked for, this Loyalist assault strikes the Word Bearers garrison like a thunderbolt. Three weeks of desperate fighting ensues, and as all the Word Bearers' urgent requests for reinforcements are ignored by the Warmaster, focused now on his push toward Terra, the sons of Lorgar resort to the most heinous of tactics. Daemons, warp-tainted infiltrators and terrors of the wars of Old Night are unleashed, with both sides driven on past mortal endurance by hatred. When the last Traitor finally fell, there was nothing left of the grand cities of Honourum but blasted ruins; ruins whose very substance was so contaminated by the fell powers and terrible weapons they unleashed that they would blight Honourum longer than the memory of the wars which spawned them.
014.M31 Siege of Terra The Siege of Terra is the final epic and cataclysmic campaign of the Horus Heresy. Many of the Loyalist Legiones Astartes had been waylaid by the forces of the Traitor Legions loyal to the Warmaster and were unable to make their way towards Terra. The Imperial Fists had already returned to the cradle of humanity and under the stern gaze of their Primarch Rogal Dorn had adequately prepared Terra's defences as best they could. Jaghatai Khan, of the White Scars Legion, had also managed to make his way to Terra with his Legion to help with the defence of the Imperial Palace. The Blood Angels Legion were also able to make the Warp jump to Terra in time to meet the oncoming Traitor invasion. Three entire Titan Legions of the Mechanicum and close to 2 million soldiers of the Imperialis Auxilia stood alongside them to face the hosts of Chaos in a battle that would determine the fate of Mankind for the next ten millennia. Yet for all the might of the Emperor, for every effort of Sanguinius and the remaining Loyalist Primarchs, the forces of Horus drove all before them. In too short a time, the Emperor of Mankind was assailed within his great palace on Terra. The siege of Terra following the initial assault on the Imperial Palace lasted for fifty-five days. Both sides knew that victory or defeat for the Imperium of Man was at hand. Inexplicably, the Warmaster lowered his void shield aboard his flagship, the Vengeful Spirit, and so, the Emperor rose to the challenge, and with Sanguinius and Rogal Dorn at His side, along with a detachment of Legiones Astartes from both Legions, as well as a the Emperor's personal guardians, the Legio Custodes. When the Loyalists teleported aboard the flagship, they were all separated by the Warmaster's fell powers and scattered throughout the massive warship. It was the Emperor who first arrived to the bloody scene in the Warmaster's throne room -- the winged corpse of the angelic Sanguinius lay at Horus' feet. Father and son fought one another in a titanic struggle, the fate of all of humanity hanging in the balance. In the end, the Emperor slew his former favoured son, but was mortally wounded during the vicious fighting. The Traitor Legions were routed and chased into the hellish realm of the Eye of Terror, while the Emperor was saved by the arrival of Rogal Dorn. Upon the Emperor's final instructions, he was placed into the confines of the great prosthetic, arcane device known as the Golden Throne, and spoke no more. Humanity prevailed, and the Imperium would live to endure, but paid a terrible price for their victory.
ca. 014.M31 The Fall of Caliban In the aftermath of the Horus Heresy, the surviving Loyalists rallied the reeling Imperium. The Dark Angels took a significant part in these battles, which later came to be called the Great Scouring. As they pursued the rebels, the I Legion diverted to nearby Caliban, which had been enshrouded by Warp Storms since Horus' betrayal. For Lion El'Jonson, one final act of treachery remained to be discovered. Upon the Dark Angels' arrival in orbit, they were fired upon from the surface. Pulling back the Legion fleet, El'Jonson tried to find out what had happened, and discovered that Luther -- who had become embittered by what he perceived as El'Jonson always taking all the glory -- had poisoned the minds of the Dark Angels garrison and the new recruits that had been left on the planet against their Primarch. In the ensuing conflagration, the Dark Angels unleash a vicious orbital bombardment on the planet's surface while the Lion confronts Luther in personal combat. The Lion is mortally wounded, while the Caliban is torn apart by the unleashed forces of the Ruinous Powers. Only their fortress-monastery of Angelicasta survives the destruction of Caliban. Luther is taken into custody and imprisoned, while the Lion's body is nowhere to be found.
ca. 014-021.M31 Great Scouring The forces of the Imperium launch a great counter-offensive against the Traitor Legions of the slain Warmaster Horus, following the end of his lamentable civil war after the Battle of Terra. Before actually being confined within the life support mechanisms of the Golden Throne, the Emperor had pronounced judgment on the Traitors: declared Excommunicate Traitoris, they were to be driven into the hellish region of the Warp rift called the Eye of Terror, which would hold them for all eternity. All records and memory of the Traitor Legions were to be expunged from the Imperial archives. Worlds such as Istvaan V and Davin were scoured clean of all life because of their corruption by Chaos. The Traitor Legions' associated troops from the Dark Mechanicum or the regiments and starships of the Imperial Army that had turned to Chaos were to be destroyed or driven into the Eye. It would be as if the Traitor Legions had never existed to sully the Imperium with their betrayal. The fighting would continue for another seven years.
Unknown Date.M31 Battle of Eskrador After the death of Horus at the end of the Horus Heresy, during the Great Scouring the Alpha Legion and the Ultramarines Legion met in battle on the world of Eskrador, where Roboute Guilliman faced his hated brother Primarch Alpharius (unaware that it was actually his twin brother Omegon, who had assumed his brother's identity following Alpharius' death at the hands of Rogal Dorn during the Battle of Pluto) in bitterly contested close combat. Both struck one another in an instant, each power sword making a single stroke. For a second the two Primarchs stood facing one another, than Alpharius slumped to the ground. Exalted by their Primarch's victory the Ultramarines renewed their attack and cut down every last Alpha Legionary. But their exaltation was short lived, as over the next few days the Ultramarines were harried from all sides by the Eskandor natives as well as remnants of Alpha Legionaries hiding throughout the mountains. After another week of futile combat against their shadowy opponents, Guilliman ordered his Ultramarines to evacuate the planet's surface. He then used his Legion's ships to bombard the traitors from orbit. Despite Guilliman's protests that he had no wish to fight such dishonourable foes, it seems hard to dispute the fact that the Ultramarines were soundly beaten by the Alpha Legion at every turn, despite the loss of Alpharius.
The Iron Cage The Iron Cage is the name given to the greatest battle fought between the Imperial Fists Legion and their hated rivals, the Chaos Space Marines of the Iron Warriors Traitor Legion, on the world of Sebastus IV. The battle was fought during the years immediately following the end of the Horus Heresy. The Imperial Fists assaulted the planet after its defences had already been prepared by the Iron Warriors, who had nicknamed their network of fortresses and defensive positions "the Eternal Fortress". Dorn vowed he would 'Dig Perturabo out of his hole and bring him back to Terra in an iron cage.' The Imperial Fists fell into the trap and suffered heavy casualties before the Iron Warriors were driven off-planet only due to the intervention of the Ultramarines Legion. The battle should have favoured the Traitors, but the Imperial Fists refused to die. When their ammunition ran out, they fought hand-to-hand, and the trenches of the Eternal Fortress ran with blood. Had Roboute Guilliman and his Ultramarines Legion not intervened, the two Legions would likely have annihilated each other, and to this day, their mutual hatred persists. The experience of the Iron Cage proved painful for the Imperial Fists but was also important in forging the modern character of the Imperial Fists and their Successor Chapters.
Eastern Fringe Genocide Following the death of Horus during the Battle of Terra, the Traitor Legions were driven into the Eye of Terror. Unlike the other Traitor Legions, after their defeat in the Thramas Crisade, the Night Lords did not splinter into separate warbands and flee like the rest of their fellow Traitors. Instead, the Night Lords conducted a massive campaign of genocide and terror against the Imperium across the Eastern Fringe of the galaxy, the likes of which has never been seen before, or since. The Legion betrays the growth of the increasing sense of self-destruction which drives its Astartes, much as it drives their Primarch. The Night Lords' rampage is only stopped by the assassination of Konrad Curze at the hands of the Callidus Assassin M'Shen upon the world of Tsagualsa.
Battle of Skalathrax On the Daemon World of Skallathrax, deep in the Eye of Terror, shortly after the Horus Heresy, the World Eaters and the Emperor's Children fought. Amid the World Eaters was the Champion of Khorne named Khârn. After a full day of vicious fighting in what would become known as the infamous Battle of Skalathrax, the terribly frigid Skalathrax night began. Horrified, Emperor's Children and World Eaters alike ran to their shelters, for the freezing night would kill even a Chaos Space Marine in a matter of moments. Khârn raged over being delayed from slaughter for even a single night. Filled with anger when he saw that his brother Chaos Marines were creeping back to the shelters, he took up a flamer and burned them down, slaying with his Chainaxe Gorechild any who tried to stop him. The night was filled with the screams of the dying and the freezing as Khârn strode the streets of the dead city of black stone, killing Emperor's Children and World Eaters alike, burning any shelters he found. The night was lit by flames as the Emperor's Children and the World Eaters fought each other and themselves for the few remaining shelters. By morning, most of the World Eaters were dead, the survivors split into small warbands, the shattered remnants of the once great Companies of the Legion. The Legion would never reunite and would remain scattered in warbands for the next ten millennia.
First Battle of Garm In the aftermath of the Horus Heresy, the Thousand Sons attacked the Space Wolves' Shrine World of Garm, which was named for a famous Wolf Lord from the earliest days of the Space Wolves Legion who had given his life defending the Primarch Leman Russ from an attack by Magnus the Red. Leman Russ raised a cairn to Garm upon the place of his death and placed the Spear of Russ, the mighty weapon gifted to him by the Emperor Himself which had wounded the Traitor Magnus, atop Garm's tomb. The Space Wolves were able to fight off the Thousand Sons Traitor Legion and drive them from the world.
675.017.M31 Shadows of the Past A Blood Angels Retribution Fleet of the 33rd Company, 9th Chapter, enters the Nostramo System and begins an investigation of the moon of Tenebor, which formerly orbited the destroyed Night Lords' home world of Nostramo. Amidst their investigation, they discovered that the expected reinforced battle station, was a lifeless and gutted corpse, indicating they had fallen to some unknown misfortune. It was later determined from the garrison's damaged data cores that they had been attacked by a Blackshield force. They had engaged and destroyed the defending garrison, leaving behind well over 1,000 auxiliary troops and some 300 Night Lords before disappearing. Upon the Hive World of Cairn, Rogue Trader Erasmus Skathe, who had arrived in the sector seeking salvage, finds evidence of a force of Legiones Astartes warriors bearing many similarities to those who struck Tenebor. This now Dead World had been inhabited by degenerate humans, and further evidence indicated that this same unknown force had trapped its inhabitants in the darkened sub-levels of its hive cities, sealed them in, and left them to die.
017.M31 The Chronicle of Ashes A task force of the Ultramarines Legion, composed of the survivors of the 19th, 48th and 207th Destroyer Cadres, encountered several renegade Word Bearers cruisers defending a lone Gloriana-class Battleship identified as the Chronicle of Ashes in the wild and uncharted space of the Dominion of Storms. Overwhelming the Traitor escort craft, the Ultramarines captured the Chronicle of Ashes in a furious boarding action involving nearly three hundred Space Marines and two full days of bloody close quarters fighting as they swept the ship's innumerable decks clear of Traitor Space Marines. In the aftermath of their victory, the Ultramarines discovered something unexpected in the vaulted halls of the Chronicle of Ashes' upper decks -- an account written in the twisted and fey language of now dead Colchis, which revealed a wealth of information regarding events previously hidden to Imperial scholars. This vessel was later cleansed and re-dedicated as the Lex Talonis, before being presented to the Ultramarines in 022.M31 and incorporated into the newly founded Nemesis Chapter.
ca. 019.M31 Third Battle of Paramar Following the conquest of the vitally important Forge World of Paramar V early on during the outbreak of the Horus Heresy, the Warmaster was forced to divert additional forces to Paramar to hold the system, forces which he had desired to use elsewhere, as having gained this great prize he could not afford for his enemies to regain it. This fear would be proved accurate as the system would see an attempted counter-invasion two years later in 008.M31, and further catastrophic warfare during the dark years of the Great Scouring in 019.M31.
033020.M31 Reclamation of the Shroud of Eventide A Blood Angels Reclamation Task Force, consisting of the 9th Chapter, Angels Vermillion, travels to the Nostramo System in order to salvage a Space Hulk designated the Crimson Intent, which was formerly known as the Night Lords' vessel Shroud of Eventide. They successfully salvage the mighty vessel and cleanse and re-dedicate it, so that it may serve the sons of Sanguinius that yet remain with honour. They also retrieve information from the hulk's damaged data cores in regards to the vessel's last battle, the mysterious Legiones Astartes Blackshield force that engaged them.
021.M31 Completion of the Codex Astartes The Ultramarines Primarch Roboute Guilliman completes his magnum opus, the Codex Astartes, a volume which lays down the new organizational and tactical doctrines for existing and future Loyalist Space Marine Chapters. The Loyalist Legiones Astartes destroyed at the Dropsite Massacre on Istvaan V were slowly reestablished using what little gene-seed the survivors had managed to escape with, though the Legions were refashioned as 1,000-Space Marine Chapters rather than full Legions as Guilliman's Codex Astartes now required after the Second Founding at the dawning of the 32nd Millennium.
The Second Founding The remaining Loyalist Legiones Astartes are broken down into a smaller existing formation, known as a Chapter, comprised of only 1,000 warriors. This ensures that one man would never again command the full might of an entire Legion of Astartes. Twenty-three new Space Marine Chapters are created in this manner, whilst the 9 existing Loyalist Legions are reshaped into smaller Chapters that continue to bear the original names of their Legions. The Grey Knights, a special Space Marine Chapter comprised entirely of psykers that will eventually evolve into the Chamber Militant of the Ordo Malleus of the Inquisition, was secretly created by Malcador the Sigillite, the Regent of Terra and chief aide of the Emperor before his death, on the moon of Saturn, called Titan. This newly formed Chapter serves as the eventual headquarters for the Ordo Malleus, the branch of the Inquisition dedicated to protecting the people of the Imperium from the daemonic forces and temptations of Chaos. The newborn Inquisition takes as its eventual symbol Malcador's personal sigil.
ca. 022.M31 Departure of the Raven Lord After the Heresy, Corax personally gave the Emperor's Peace to every surviving aberrant Astartes that had resulted from the Raven Guard's accelerated program of Space Marine development, an act that led him to lock himself in his personal chambers in the Ravenspire on Deliverance and beg the recently-ascended Emperor for forgiveness. Unable to alleviate his guilt, the Primarch left the Ravenspire exactly a year after he first went into seclusion in a transport that was headed for the Eye of Terror. Corax's fate remains unknown to this day. His last recorded words as he departed Deliverance were, 'Nevermore'.
ca. 022-Unknown Date.M31 The Scourge of Dynat Crowbane Driven outwards by the resurgent armies of the Emperor of Mankind following the Battle of Terra in what was later called the Great Scouring, Dynat Mal, the main architect behind the Raven Guard's shaming defeat at the Battle of Lyx, took his forces to the Dark Marches region of the Segmentum Tempestus. There he raided and destroyed the major outpost on Amarah Prime and gathered a coterie of renegades, mutants and heretics that took the name of "The Shadowed Ones". Hiding out with his fleet in the debris fields and nebulas of what would one day become the Orpheus Sector, Dynat Mal successfully ambushed and destroyed several Imperial punitive expeditions and established a reign of terror that lasted for several decades. Although the fate of the Shadowed Ones remains a mysterious one, it is generally believed that Dynat Mal was defeated and subsequently killed by an awakened portion of Necrons belonging to the Maynarkh Dynasty.
ca. 032.M31 Castigation of Colchis Following the end of the Horus Heresy, the Imperium of Man launched a retribution crusade, known as the Great Scouring, to drive out the remaining Traitor Legions and those forces still loyal to them. Following this period of bloody vengeance and violence, around 032.M31, the Ultramarines were finally able to take the fight to Colchis in retribution for what the Word Bearers had done to Calth during the early years of the Horus Heresy. When they arrived they found a devastated world, its industry in ruins and its people clinging desperately to civilisation. Given Lorgar's treachery and the Imperium's fear that his Chaotic taint had spread throughout the population who had converted to the Word Bearers' heretical faith in the Ruinous Powers, the newly-formed Inquisition ordered the planet to undergo Exterminatus and the Ultramarines' Battle Barge, Octavius, bombarded Colchis with Cyclonic Torpedoes. The geological structure of Colchis was highly unstable and the resultant seismic activity caused by the torpedoes' detonations split the planet apart. Nothing now remains of Colchis and where it once existed is still a closely guarded secret by the Inquisition.
ca. 084.M31 Disappearance of The Khagan While traveling into a region of space known as the Maelstrom, a large Warp rift in the Ultima Segmentum that is a somewhat smaller counterpart of the Eye of Terror, the Primarch of the White Scars, Jaghatai Khan disappeared. It is believed that the Khagan was in pursuit of the Dark Eldar who had savaged Mundus Planus following the Battle of Corusil V with his 1st Brotherhood when he went through a Warp Gate into the Dark Eldar portion of the Webway, ultimately vanishing forever. None can say what befell the Primarch -- if he was lost in the Warp or if he was slain or captured at the hands of an alien warlord -- but the White Scars believe he still hunts across the galaxy, and beyond, in pursuit of his greatest foes. The also believe the Khagan is still alive somewhere within the Webway and will one day return to the Chapter and its Successors in a time of great need.
ca. 109.M31 Rise of the Raven Guard For the first time, since the disaster of the Dropsite Massacre on Istvaan V, the Raven Guard Chapter finally reaches a significant combat strength not seen in over a century.
120.M31 Dark Angels Search for Recruiting Worlds Necessity demands that the Dark Angels find a new recruiting world after the destruction of Caliban, but at this date, a conscious decision is made instead by the Chapter to establish many. This plan is agreed to by the High Lords of Terra as it allows for contingencies and preserves the Chapter's genetic diversity. For the Dark Angels, it allows the preservation of a mantle of secrecy, for no one is entirely sure of the number of the Chapter's recruiting worlds or of how many Aspirants are taken into The Rock.
ca. 121.M31 Death of the Avenging Son Roboute Guilliman continued to serve with the Ultramarines Chapter after the Heresy, leading them for another century after the Second Founding. It is Guilliman's actions subsequent to the Horus Heresy that made him the figure of adoration that he would become. With the traitors scattered and the Emperor to all intents and purposes lost to Humanity, the Imperium stood at the precipice. It was the genius and leadership of Roboute Guilliman that saw the Imperium through its first century, as he kept invaders at bay and saved the scattered worlds from collapsing into anarchy. While fighting on the world of Thessala, Roboute Guilliman fell at the hands of his erstwhile brother, Daemonically-ascended Primarch Fulgrim of the Emperor's Children Traitor Legion. Poisoned unto death, Guilliman's barely living body was placed in a stasis field, and later enthroned in the Ultramarine’s fortress-monastery. There it remains to this day, and some say that within the timeless aura of the stasis field, his body heals, and he may one day be returned to defend the Imperium he strove so hard to build.
Unknown Date.M31 Disappearance of the Regent of Nocturne Vulkan, Primarch of the Salamanders Legion departs on some mission he never declared to the Imperium at large, and disappears from Imperial history. He would not reappear for nearly 1,500 years during the War of the Beast in the mid-32nd Millennium.
211.M31 Disappearance of the Wolf King On the eve of the holiday, known as the "Feast of the Emperor's Ascension", which commemorates the day the Emperor defeated Horus and "ascended" back into the Immaterium after being entombed upon the Golden Throne, Leman Russ and his Wolf Lords were gathered for a feast to celebrate. On this occasion, Leman Russ quieted the great hall of his warriors to speak, but then froze in place as his eyes glazed over as if seeing a vision. The assembled Space Wolves looked on in horror as their Primarch fell to his knees and called for his Wolf Guard and closest retainers to attend him, all save the youngest, Bjorn the Fell-Handed. Giving his closest companions his instructions, Russ turned and left the Great Hall with his bodyguard in tow, leaving only Bjorn behind. The tale of his disappearance is retold every thousand standard years by the Dreadnought Bjorn the Fell-Handed, the oldest Astartes Dreadnought still in service in the entirety of Imperium. After seven years of waiting, the Space Wolves elect Bjorn as their first Great Wolf, the de facto Chapter Master of the Space Wolves, to rule in Russ' stead.
781.M31 The 1st Black Crusade Abaddon the Despoiler, the new Warmaster of Chaos Undivided, made his first attempt to launch a new offensive against the Imperium of Man following the Horus Heresy, and when he unleashed the 1st Black Crusade and the First Battle of Cadia. This attempt eventually fails and the Forces of Chaos are unable to penetrate the Cadian Gate that will allow them to take control of the only truly navigable pathway out of the Eye of Terror and into Imperial space. For the next 10,000 standard years, Abaddon will bend all of his efforts to finding a way to complete what Horus began and launch a Chaotic war that will conquer Terra and eliminate the 'Corpse-Emperor'. These massive assaults become known as "Black Crusades" to the people of the Imperium. During epic conflict, the Imperial Fists Primarch Rogal Dorn supposedly "died" fighting aboard a Chaos Space Marine vessel after leading an assault on a large Chaos warfleet that emerged from the Eye of Terror and vastly outnumbered the Imperial defenders. Seeing the importance of attacking the enemy fleet whilst they were still preparing to invade Imperial space, Dorn relied on hit-and-run attacks until his reinforcements could arrive. Dorn "died" aboard the Chaotic Despoiler-class Battleship known as the Sword of Sacrilege after leading a desperate attack on its bridge. When Dorn and his elite Honour Guard stormed the bridge they were cut down to a man. Later, the Imperial Fists would pick up an escape pod from one of their own ships present at the battle, which contained the weapons and Power Armour of their beloved Primarch. The only sign of Dorn was a single skeletal fist that the Imperial Fists believed belonged to Lord Dorn. What fate ultimately befell the Primarch, and whether he truly died or not, has yet to be determined with absolute certainty.
ca. 900.M31 Establishment of the Temple of the Saviour Emperor A highly decorated Imperial Army officer takes the name "Fatidicus," meaning 'prophet', and secretly establishes the Temple of the Saviour Emperor on Terra in violation of the atheistic doctrines of the Imperial Truth. His teachings will eventually spread across the entire newborn Imperium of Man, via the Imperialis Auxilia and Armada Imperialis.


  • Codex: Chaos Daemons (6th Edition), pg. 20
  • Codex: Chaos Space Marines (6th Edition), pp. 6, 8-12, 14, 20, 23, 40, 48, 57, 62, 69
  • Codex: Chaos Space Marines (4th Edition), pp. 12-15, 22, 46
  • Codex: Chaos Space Marines (3rd Edition, 1st Revision), pp. 4-5, 44
  • Codex: Chaos Space Marines (3rd Edition), pg. 22
  • Codex: Chaos (2nd Edition), pp. 8-11, 17-18, 98-99
  • Codex: Grey Knights (5th Edition), pg. 6
  • Codex Imperialis (2nd Edition), pp. 10, 16, 20
  • Dark Heresy: Blood of Martyrs (RPG), pg. 7-9, 27, 104-105
  • Dark Heresy: Daemon Hunter (RPG), pg. 7
  • Dark Heresy: The Radical's Handbook (RPG), pp. 78, 80, 93, 120
  • Deathwatch: Core Rulebook (RPG), pp. 12-13, 39, 41, 43-45, 48-49, 53, 79, 164, 182, 322-323, 361
  • Deathwatch: First Founding (RPG), pp. 4, 7, 14, 16, 21, 27-28, 41, 47, 54, 67, 76-94, 116, 127
  • Deathwatch: Honour the Chapter (RPG), pp. 5, 9, 13, 60, 66, 74, 82, 89, 104, 139,
  • Imperial Armour - The Horus Heresy Betrayal - Book One by Alan Bligh
  • Index Astartes I, "The Unforgiven - The Dark Angels Space Marine Chapter," "Children of the Emperor - The Emperor's Children Space Marine Legion," "Bitter and Twisted - The Iron Warriors Space Marine Legion," "Lightning Attack - The White Scars Space Marine Chapter," "Blood Frenzy - The Flesh Tearers Space Marine Chapter," "Warriors of Old - Space Marine Dreadnoughts," "Psykana Librarius - Space Marine Librarians"
  • Index Astartes II, "Wolves of Fenris - The Space Wolves Space Marine Chapter," "Emperor's Fist - The Imperial Fists Space Marine Chapter," "Bringers of Darkness - The Night Lords Space Marine Legion," "Angels of Death - The Blood Angels Space Marine Chapter," "Righteous Zeal - The Black Templars Space Marine Chapter," "For the Emperor - Space Marine Chaplains"
  • Index Astartes III, "Hand of Justice - The Iron Hands Space Marine Chapter," "Chosen of Khorne - The World Eaters Space Marine Legion," "Warriors of Ultramar - The Ultramarines Space Marine Chapter," "The Lost and the Damned - The Death Guard Space Marine Legion," "Masters of Forbidden Knowledge - The Thousand Sons Space Marine Legion"
  • Index Astartes IV, "Sons of Horus - The Black Legion Space Marine Legion," "Dark Apostles - The Word Bearers Space Marine Legion," "Promethean Warriors - The Salamanders Space Marine Chapter," "Claws of the Raven - The Raven Guard Space Marine Chapter," "The Enemy Within - The Alpha Legion Space Marine Legion," "Bloodied Fist - The Crimson Fists Space Marine Chapter," "Deep Strike - Tactical Dreadnought Armour"
  • Realm of Chaos: The Lost and the Damned (2nd Edition), pp. 9, 164, 177-184
  • Realm of Chaos: Slaves to Darkness (2nd Edition), pp. 240-241, 243-244, 268
  • The Horus Heresy - Book Seven: Inferno by Alan Bligh (Forge World Series), pg. 10
  • The Horus Heresy: Collected Visions (Background Book)
  • Warhammer 40,000 Rulebook (6th Edition), pp. 137, 158, 160-161, 168, 183, 186, 225, 228, 380, 403
  • White Dwarf 332 (US), "Chaos Space Marines", p. 16
  • White Dwarf 274 (US), "Chapter Approved: Chaos Space Marine Legions"
  • White Dwarf 268 (US), "Assault on Holy Terra", "Abaddon the Despoiler" & "Index Astartes First Founding: Sons of Horus, The Black Legion Space Marine Chapter"
  • White Dwarf 265 (AUS), "Index Astartes - The Death Guard"
  • Horus Rising (Novel) by Dan Abnett
  • False Gods (Novel) by Graham McNeill
  • Galaxy In Flames (Novel) by Ben Counter
  • Flight of the Eisenstein (Novel) by James Swallow
  • Fulgrim (Novel) by Graham McNeill
  • Descent of Angels (Novel) by Mitchel Scanlon
  • Legion (Novel) by Dan Abnett
  • Battle For the Abyss (Novel) by Ben Counter
  • Mechanicum (Novel) by Graham McNeill
  • Tales of Heresy (Anthology) edited by Nick Kyme & Lindsey Priestly
  • Fallen Angels (Novel) by Mike Lee
  • A Thousand Sons (Novel) by Graham McNeill
  • Nemesis (Novel) by James Swallow
  • The First Heretic (Novel) by Aaron Dembski-Bowden
  • Prospero Burns (Novel) by Dan Abnett
  • Age of Darkness (Anthology) edited by Christian Dunn
  • The Outcast Dead (Novel) by Graham McNeill
  • Deliverance Lost (Novel) by Gav Thorpe
  • Know No Fear (Novel) by Dan Abnett
  • The Primarchs (Anthology) edited by Christian Dunn
  • Fear To Tread (Novel) by James Swallow
  • Shadows of Treachery (Anthology) edited by Christian Dunn
  • Promethean Sun (Novella) by Nick Kyme
  • Aurelian (Novella) by Aaron Dembski-Bowden
  • Army of One (Short Story) by Rob Sanders
  • Angel Exterminatus (Novel) by Graham McNeill
  • Betrayer (Novel) by Aaron Dembski-Bowden
  • The Scripts: Volume 1 (Anthology) Edited by Christian Dunn
  • The Weakness of Others (Short Story) by Laurie Goulding
  • Crimson Fist (Novella) by John French
  • Kryptos (Ebook) by Graham McNeill
  • Dark Heart (Ebook) by Anthony Reynolds
  • The Gates of Terra (Ebook) by Nick Kyme
  • The Dark King & The Lightning Tower (Audio Drama) by Graham McNeill & Dan Abnett
  • Raven's Flight (Audio Drama) by Gav Thorpe
  • Butcher's Nails (Audio Drama) by Aaron Dembski-Bowden
  • Garro: Oath of Moment (Audio Drama) by James Swallow
  • Garro: Legion of One (Audio Drama) by James Swallow
  • Garro: Sword of Truth (Audio Drama) by James Swallow
  • Veritas Ferrum (Audio Drama) by David Annandale
  • Burden of Duty (Audio Drama) by James Swallow
  • Grey Angel (Audio Drama) by John French

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