Atlas Blood Massacre

The Atlas Blood Massacre was an Imperial excoriation campaign conducted by the Zero Legion Space Marine Chapter on the Imperial civilised world of Atlas, against invading Forces of Chaos.

History
Responding to a distress call from the Civilized Worlds, Atlas, the Chapter sends the 8th and 11th Division to aid the planetary forces against a large mass of Khorne cultists and elements of the World Eater Traitor Legion. Recognizing the large difference in numbers, despite technological advantage, the Zero Legion resorts to guerrilla tactics, such as ambushes, hit & run, and lightning strikes, weakening and aggravating the Chaos forces. The constant skirmishes, combined with their ever growing bloodlust, caused the World Eaters and Chaos Cultists to turn on each other, slaughtering one another in a frenzy. After five hours of observation, the Zero Legionaries and Atlas forces moved in and wiped out the remaining Chaos Forces. This was the first campaign where the chapter suffered minimal loses.