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Orgrim Doomhammer the Backstabber was once Blackhand's most trusted general, who fought savagely in the First War, but he knew that it was not Blackhand, but Gul'dan, who was leading the Horde. So, when Gul'dan was rendered useless by the death of Medivh, Doomhammer struck Blackhand, killing him and usurping the title of Warchief over the Clans of Azeroth as Chieftain of the Blackrock Clan. It was Doomhammer who led the final assault against Stormwind Keep and secured the lands of Azeroth as his own, despite the heavy losses the Horde felt. As he picked up the pieces of his people and gathered new allies and factions within the Horde, Doomhammer heard tell of the exodus from Azeroth, and vowed to hunt down the humans wherever they chose to run.

Doomhammer was visited by his old friend Durotan of the Frostwolf Clan. Gul'dan had exiled their clan from the Horde when Blackhand was in power. Durotan explained the significance of Gul'dan's betrayal, and Doomhammer promised to consider the matter carefully.

Knowing that Gul'dan would prove a problem, Doomhammer sought to uncover the secret workings of the Horde, and the true power behind Blackhand, and found Garona. Torturing her into submission, she revealed the existence and location of the Shadow Council. Immediately, Doomhammer struck, launching the considerable forces of the Blackrock Clan against the Shadow Council and the Stormreavers. In an effort to carry out his pledge to Durotan, Doomhammer slaughtered every last Warlock, except Gul'dan, who pointed out that he was not the last true sorcerer within the Horde. Doomhammer, not wanting to leave himself open to the humans, allowed Gul'dan to live.

Doomhammer received news that the Black Tooth Grin Clan, led by Rend and Maim, the sons of Blackhand, was attempting to spur the Raiders of the Sythegore Arm, of whom Blackhand was a member, into revolt. Doomhammer pre-emptively disbanded the Raiders, distributing their forces into the ranks of the Grunts. Gul'dan then secured his place in the Horde by promising Doomhammer a magic-wielding undead force loyal to him. Doomhammer agreed.

But he was soon distracted as the Horde plunged into the Second War, pushing back into Khaz Modan and securing the lands as south as Stranglethorn.

Despite his multiple victories and new alliances, Doomhammer found himself met by resilient human forces. Though he made alliances with the Goblins of Khaz Modan and the Trolls of Quel'thalas, Doomhammer found that sheer numbers were simply not enough to overcome the Alliance. Finally, an attack was made on Blackrock Spire, and Doomhammer made a mad rush from the citadel and squared off with none other than Anduin Lothar himself. The battle drained the life of both combatants, but in the end, Lothar fell. His followers, however, rose up out of grief and sorrow and fought the orcs with new vigour. The orcs fell, and the war was ended.

Doomhammer and his clan was captured by the Humans, and Doomhammer was kept by Terenas himself as a personal prisoner. Most of the other orcs were rounded up and placed in internment camps. In the Aftermath, Doomhammer escaped from Lordaeron. But, clanless as he was, he wandered the countryside as a hermit, going from orcish outpost to outpost, being captured several times, but escaping from the internment camps unnoticed.

At one point many years later, Doomhammer happened across Grom Hellscream, one of the few remaining chieftains of the Old Clans. Grom told him of Thrall, a dynamic young Orc whose ideas of revolution within the Horde and reexamination of the ancient shamanistic traditions could mean the new dawn for the Horde. Doomhammer sought Thrall in the Alterac mountains in an all but fruitless search. Until he happened upon a white wolf.

The wolf was Wise-ear, the frost wolf of Drek'Thar, one of the last Shamans in the entire Horde. Wise-ear brought Doomhammer to a hidden encampment of the Frostwolves, where Doomhammer posed as a mysterious traveler, watching Thrall. He then riled Thrall up into a fight and faced Thrall in single combat. Thrall's mercy was all that saved him. When Doomhammer revealed himself to the young Shaman, Thrall was honoured, and listened to Doomhammer's teachings of what his father, Durotan had fought and died for. Orgrim then set into motion a great plan to free the enslaved orcs in Azeroth.

The first four camps were freed with little incident, until the fifth, when a brigade of Blackmoore's troops had been waiting. The furious battle that ensued found Ogrim stabbed through the chest plate with a human lance. Thrall pulled the lance from his wounds, and Doomhammer, in his dying breath, bequeath the title of Warchief to Thrall, moments before dying in his pupil's arms.

When Thrall established Durotar, he named its capital city Orgrimmar, in honour of his teacher.