The Barbarossa Crusade was an Imperial Crusade carried out by the Black Templars Space Marine Chapter to cleanse the Black Templars Chapter Keep located on the world of Barbarossa IV that had become the residence of Orks fleeing the fighting on the Hive World of Armageddon following the Third War for Armageddon in 998.M41. But that was only the beginning, for unknown to the Black Templars the relic at the core of the Keep had become tainted by Chaos. The Black Templar Crusade forces under the command of Castellan Hermann fought to cleanse the Chapter Keep of both the Greenskins and the Chaotic taint, which had manifested in the form of a daemonic intrusion and the Chaotic corruption of the Black Templars garrison which had held the keep. The Black Templars eventually crushed the threat, eliminated the Warp-taint and their Renegade Battle-Brothers and recaptured their ruined keep. The Astartes then moved on to eradicate the remaining Ork forces on the world.
- Codex: Black Templars (4th Edition)