War for the Andromax System
The War for the Andromax System occurred during the 8th Black Crusade, when a combined force of Night Lords and Iron Warriors captured the Imperium's Andromax System.[1]
Once word of this reaches the Adeptus Custodes, they declared the system's capture to be a direct threat to Terra and made plans to destroy the traitors. They knew however, that they would need aid to do this and asked the Fabricator-General Uixot, for Martian assistance in the endeavour. The notoriously insular Uixot at first refused, but agreed to help after a diplomatic mission from the Adeptus Custodes met with him and stroked his ego. Mere months later, a combined force of the Minotaurs Chapter, Adeptus Mechanicus and Custodians from the Dread Host, annihilated the traitors and reclaimed the Andromax System for the Imperium.[1]
Sources
- 1: Codex: Adeptus Custodes (8th Edition), pg. 31 — The Tale of the Ten Thousand: Envoys to the Omnissiah