Second Battle of Gabarlos

The Second Battle of Gabarlos was a dark chapter in the history of the Hammer Guard Space Marine Chapter, when their former brethren from the 2nd Company and their newly corrupted brothers from the Hammer Guard's Successor Chapter, the Solar Wardens, hatched a plan to bring ruin to both their Chapters and declare their heretical beliefs. The Forsaken Hammers fought alongside the corrupt 2nd Company, dealing a physical and mental blow to their brothers before retreating, joined by the Solar Wardens' corrupt Boar Company, as they fled to the Maelstrom. Along the way, they raided world after world, sowing death and the seeds of corruption as they ransacked homes and village

History
As their brothers in secret revealed themselves, the Forsaken Hammers were summoned by their brothers to aide them in the fight against the Hammer Guard, who had refused to be corrupted, saved by 'That Damned Cybus'. They fought with unbridled fury at the sight of their former Chapter, their hatred beyond comprehension. Eventually the Forsaken Hammers were forced to retreat back to the Warp, but not before making sure they were forgotten no more.