Look in chapter 10.
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Bilbo is still separated from his compatriots and he has the task of separating their barrels from the rest of the group. As they approach Laketown, Bilbo is sure to listen to the different wood-elves and lake-men that he remains hidden from. But for a long while, all Bilbo can do is wait for the seemingly endless river to take its course and bring him and his cargo to a place where he might safely bring them to shore. When Bilbo is able to do this, he finds the barreled dwarves in poor conditionbut at least they are alive, and very grateful to Bilbo for his services. The Master of this region is familiar with the prophecy that foretells the reclamation of Smaug's horde of stolen treasure. Accordingly, Thorin is heralded and celebrated as a hero, for he is the descendant of Thror, King under the Mountain.
The Master permits several days of celebration, offers aid and is happy when the group leaves he is rather sure that they are going to fail on their mission: Smaug is dangerous. When they leave, the dwarves and Bilbo now take the watery course, replenished and more confident than before. Bilbo is "the only person thoroughly unhappy."