Sancta Angelis Campaign
From Warhammer 40k - Lexicanum
The Sancta Angelis Campaign was a battle fought in M39 between the Orks under Warboss Irongol and the Raptors Space Marine Chapter.[1]
A Raptors taskforce isolated from Imperial support and communication by warp storms conducted a thirty-year campaign against Waaagh! Irongol culminating in the elimination of Warboss Irongol himself, ending the Waaagh!.[1]
During this deployment the Raptors made use of desert camouflage.[1] The symbol of this campaign was a crowned skull.[2]
Trivia
Conflicting sources
In Imperial Armour Volume Two - Second Edition, it was stated that this campaign was in 339.M41.[3]