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 foreshadowed that of Christ. The fall of Gandalf, who fell to save his companions, thus parallels the crucifixion of Christ to save the human race. One of the most obvious Christian themes in Tolkien's writings is the resurrection of Gandalf, who had to sacrifice everything—even his years of plans, efforts, and his very hopes that the Dark Lord might be defeated—in order to secure the safety of the Fellowship. Like Jesus who carried his cross for the sins of mankind, Frodo carried a burden of evil on behalf of the whole world. Frodo walks his "Via Dolorosa" to Mount Doom