Assault on Blackrock Spire was the pivotal battle of the Second War, when the forces of the Alliance scored a major victory that culminated in the capture of the Orc Warchief Orgrim Doomhammer, smashed the fighting elite of the Horde's army, and ultimately ensured their victory at the Dark Portal. The battle was not without its price as thousands of the Alliance's best troops died at the slopes of the mountain, including Sir Anduin Lothar, Regent Lord of Azeroth, and Supreme Commander of the Alliance.