- Indomitus Crusade (ca. 999.M41 - ca. 111.M42) - The Adamantine Lions were assigned to serve as part of Task Force XI of Battle Group Kallides of the Indomitus Crusade Fleet Primus. Battle Group Kallides fought against the Necrons located in the foreboding region of the galaxy designated the Pariah Nexus.
- Argovon Campaign (Unknown Date.M42) - This campaign of the Pariah Crusade was fought in the Argovon System within the Pariah Nexus region. The Imperial forces faced the Necron Szarekhan and Oruskh Dynasties. The campaign was spearheaded by High Field Marshal Janred Remko Hynflagger and his Task Force XI. At the system capital and Shrine World of Argolish the Imperials found the effects of The Stilling at its weakest. Yet, the world had still been assaulted by Necrons who had emerged from a Dolmen Gate. The Astra Militarum's 811th Veolan Black Guard regiment won renown for the running battle that lasted for 100 solar days through the Great Gardens of St. Bartholema the Pure Heart. They were aided by a Terminator assault from the Adamantine Lions, who slew a Necron Lord and a member of the Necrons' council. This confusion bought time for the 82nd Varhian Jackals of the Militarum Tempestus to evacuate the priceless mosaic of the Emperor called The Most Glorious Emperor While He Yet Walked Among Us from the small chapel that held it.
The Adamantine Lions' Chapter colours are not listed in current Imperial records.
The Adamantine Lions' Chapter badge is not listed in current Imperial records.
- White Dwarf 457 (October 2020), "Flashpoint: Argovon System," pg. 55
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