Battle of the Peak

Battle of the Peak was a fight between Gandalf the Grey and the Balrog (Durin's Bane).

After both fell into the deep chasm, Gandalf recovered himself and pursued his foe all the way up the Endless Stair and into Durin's Tower, where the two engaged in a two-day long battle. Gandalf was victorious but died of his wounds. The battle left Durin's Tower in ruins and caused the destruction of the Endless Stair.