Look in chapter 2 for the answer.
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The company travels into a region called the Lone-lands and it is not long before Bilbo has traveled far beyond his previous limits. He already wishes that he was at home, warming himself by the fire and drinking tea and the torrential downpour is not helping his mood.
The group is not as organized as they should be; they only notice Gandalf's absence well after he has departed and they cannot start a fire to cook dinneron account of the rain and wet. The two youngest dwarves, Fili and Kili, are nearly drowned when one of the ponies is frightened and nearly loses himself in the river.
They spot a light in the distance and since Bilbo is the burglar of the group it is his job to go and investigate the scene. Arriving at the fire, Bilbo discovers three trolls who are roasting mutton on spits. They are, of course, significantly larger than Bilbo and summoning his nerves, Bilbo decides to live up to his profession by pick-pocketing. Bilbo reaches for the troll's purse but the bag squeaks: "Ere, oo are you?" and of course, the troll seizes Bilbo. The three trolls, Bert, William and Tom are discussing exactly what a hobbit is and whether Bilbo is worth eatingand if so, how should he be prepared?
The trolls argue over Bilbo's fate and when they are physically engaged with one another, Bilbo escapes though not without bruises. Unfortunately, the scene does not end here because the dwarves grew impatient while waiting for Bilbo and, hearing the trolls' noises, decided to approach the fire. Trolls hate the sight of dwarves and the appearance of Balin sets Tom and the other trolls on a rampage. It is not long before all twelve of the dwarves are held in sacks and the trolls are contemplating another dinner. Gandalf rescues the dwarves with an invisible appearance. He periodically interrupts the trolls' conversation, saying false statements in voices that resemble the trolls' voices. Bert, William and Tom each conclude that the other two are lying and/or mad and of course, they engage in more physical brutality, whacking each other in the head and arguing until dawn is suddenly upon them and they turn into rocks.