To avoid the Eye of Sauron, the Fellowship of the Ring decided on the dangerous route through the Mines of Moria. Far down in the subterranean depths of the Misty Mountains they fought with trolls and Orcs, until they encountered the most fearsome of all of Morgoth's creatures, the Balrog. On the narrow Bridge of Khazad-dum, Gandalf fought this terrifying nightmare and struck it with his staff. In the midst of this life and death struggle the bridge crumbled and they fell into the unfathomable depths.