Gandalf winter, they crossed "under" the mountains through the Mines of Moria, though only Gimli the Dwarf was enthusiastic about that route. In Moria, they discovered that the Dwarf colony established there earlier had been overrun by orcs. The Fellowship fought with the orcs and trolls of Moria and escaped them. At the Bridge of Khazad-dûm, they encountered "Durin's Bane", a fearsome Balrog from ancient times. Gandalf faced the Balrog to enable the others to escape. After a brief exchange of blows, Gandalf broke the bridge beneath the Balrog with his staff. As the Balrog fell, it wrapped its whip around
Themes of The Lord of the Rings "The Lord of the Rings" is contrasted sharply with the prominent role also given to choice and free will. Frodo's voluntary choice to bear the Ring to Mordor is seen to be an act central to the plot of the whole story. Also important is Frodo's willing offer of the Ring to Gandalf, Aragorn, and Galadriel, and their willing refusal of it, not to mention Frodo's final inability to summon the will to destroy it. Thus, free will as well as fate is seen to be a constant theme throughout the story: from Sam's vision of old Gaffer Gamgee's wheelbarrow