Orkamungus dominated several large Ork clans, and unleashed his WAAAAGH! upon the planet of Tartarus, quickly isolating the major Imperial cities and overrunning the defenders with an unstoppable tide of Ork Boyz. Orkamungus led the assault in person on a vitally important spaceport that the 37th Tartarus Planetary Defense Force Regiment was using in an attempt to evacuate civilians from the doomed world. The tidings of battle soon turned, however, as the Blood Ravens Space Marines arrived on the battlefield by Drop Pod and held back the green tide of Orks.