Bilbo stays invisible for weeks listening to conversations of the Wood-Elves. The king's first man<-? and a guard test some wine in the basement of the Wood-Elf compound. They fall asleep and Bilbo steals the guard's keys. Bilbo unlocks the cells of the dwarves and he puts them in empty tubs that the Wood-Elves were about to throw out through their river disposal system, (I can't quite remember what it was called), and the elves who throw out the tubs threw out the dwarves without even looking in them. Bilbo had one problem though, he wasn't in a tub, so he had to grab on to a barrel and float into the lake where the dwarves and Bilbo are accepted and fed and housed.
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saved them from the spiders
A share in Smaug's treasure and adventure.
Which book, which part? There could be several answers, you haven't provided enough info. The first thing that comes to mind are the eagles from the Hobbit ... but there's no way to tell without more info.Gandalf came to their rescue in Chapter 4 using "Glamdring the Foehammer."
Bilbo's surname is Baggins.
Bilbo becomes very fierce when he kills the spider who was trying to capture him. This leads him to rescue the dwarves by killing many spiders and leading them away. He becomes the dwarves leader, and they follow.