According to Fallout Tactics, Gammorin was one of the leaders of the faction of super mutants who fled to the East after the death of the Master and the destruction of Mariposa Military Base. Some time after their departure, Gammorin's mutants was pursued by Brotherhood of Steel airships. While most of them ended up in the vincinity of Chicago, far from Gammorin's forces, one of the zeppelins crashed north of the mutant encampment. The leader, Paladin Latham, challenged Gammorin to a single unarmed combat and, to surprise of everyone, killed the mighty mutant. As he defeated the previous chieftain, the super mutants expected him to become the new leader of their army and he assumed Gammorin's name. Latham suffered a head injury during the combat, and throughout the years, he grew more and more insane, even though he managed to organize the mutant forces into an army nearly as powerful as they had been during the Master's reign.