Bilbo begins right outside the goblin tunnels the special world begins when they start the trail to the mountains. Gandalf tells them they must go before the goblins find them. He doesn't want to go without eating but doesn't want to be found by the goblins so he goes. Bilbo's "mentor" is Gandalf. When the trail begins is when he "crosses the threshold". Bilbo's allies are Gandalf , the dwarves , and the eagles. His enemies are the goblins and the wargs. Bilbo is tested by perserverence because he has to keep going even though they don't have food.