Defence Turrets, also known as Base Defence Turrets, are large static weapon emplacements used by the Imperium of Mankind to protect important structures and other strategic facilities from enemy attack. Defence Turrets are mounted on top of a large set of stabiliser legs using versatile anti-air mounting systems that give the turret the capability of engaging both enemy air and ground units. The Defence Turret is capable of being locked onto the tops of Imperial pre-constructed modular buildings, such as the common Phaeton Pattern Defence Turret, or simply mounted onto rockcrete platforms built into the ground. The turrets can also be part of other Imperial structures such as Defence Lasers and fortress walls. The most common pattern of the Defence Turret in use by the Imperium is the Phaeton Pattern. It is unrecorded in Imperial records whether or not the Defence Turret was manned by Imperial personnel or Servitors located either inside or nearby the weapon or if it is automated using a Machine Spirit (Aritficial Intelligence) much like the Tarantula Sentry Gun.
The most common armament of the Defence Turret is a set of twin-linked, long-barrelled Autocannons. These weapons are fully capable of engaging and destroying most enemy ground vehicles and aircraft with their explosive fire. Each Defence Turret armed with these weapons also has storage for up to 20,000 rounds of ammunition, allowing them to go long periods of time without needing to be reloaded. Imperial records do not indicate whether or not the Defence Turret can be armed with any other types of weapons. Defence Turrets can be outfitted with searchlights to help them identify their targets.
The Defence Turret has a single known variant in Imperial records, the Communications Array:
- Communications Array - The Communications Array is a variant of the Defence Turret that replaces the turret's standard Autocannons with a large communications dish. This variant is mounted in much the same way as the standard Defence Turret, although it is not used to defend from enemy attack but instead to send and receive Vox communications from forward outposts and starships in orbit.
The following are known recorded uses of the Defence Turret:
- Anphelion Base - The secret Adeptus Mechanicus research facility located on the planet Beta Anphelion IV maintained four Defence Turrets and a single Communications Array. Unfortunately, these defences proved to be ineffective against the Tyranids that escaped from that facility.
- Duty's Fist Defence Laser - Duty's Fist was an emplaced Defence Laser located near the west gate of Bellephon on the former Imperial world of Thesus Reach. Duty's Fist featured a pair of Defence Turrets that protected it from enemy attack.
Adeptus Mechanicus Technical Specifications
|Vehicle Name:||Defence Turret||Main Armament:||Turret-mounted, twin-linked, long-barrelled Autocannons|
|Forge World of Origin:||Phaeton, others||Secondary Armament:|
|Known Patterns:||Unknown||Traverse:||360 degrees|
|Crew:||Unknown (May be automated)||Elevation:||Unknown|
|Powerplant:||Unknown||Main Ammunition:||20,000 Rounds|
|Height:||2.5 metres (approx.)||Superstructure:||Unknown|
|Max Speed On-Road:||N/A||Gun Mantlet:||Unknown|
|Max Speed Off-Road:||N/A||Vehicle Designation:||Unknown|
|Transport Capacity:||N/A||Firing Ports:||N/A|
- Imperial Armour Volume Four - The Anphelion Project, pp. 149-158
- Games Workshop Apocalypse Datasheet: Defence Laser