Captain Jehnnus Ardias of the Ultramarines Third Company, led the Third Company against the Tau but later negotiated a ceasefire with them when Governor Severus aligned himself with the daemon Tarkh'ax and the Word Bearers.
Ardias forced an override in the communications of a Tau Fire Warrior named La'Kais and guided him against the Word Bearers and subsequently helped Kais by holding of Tarkh'ax until Kais destroyed the daemon.
- 1: Fire Warrior (Novel), [Needs Citation]
- 2: Codex: Space Marines (5th Edition), pg. 23
- 3: Imperial Armour Volume Two - Second Edition: War Machines of the Adeptus Astartes, pg. 85
- 4: Imperial Armour Volume Two - Space Marines and Forces of the Inquisition