{| |- | Dori was the one who helped him. He climbed back down out of the tree and boosted Bilbo up. He was almost caught by the wolves as he scrambled back up into safety. |}
Bilbo uses his magic ring and his wits. He follows Gollum with the ring on and is able to leap over him to get to the back door. There he squeezes through, though he lose his buttons doing so.
Yes, in chapter 9 the dwarves (but not Bilbo) were imprisoned by the Wood-elves in Mirkwood forest.
They escape in barrels sent downriver to be filled.
After climbing the tree, Bilbo is filled with a sense of adventure, rather than his previous desire to live life quietly.
Bilbo's escape plan is mediocre. He risked the lives of the dwarves while trying to carry it out.
I think it was Bilbo Baggins
if referring to chapter 10, the quick escape
* Smaug didn't like them thumping their barrels. * Bilbo in being clever about who he was claimed to be 'barrel rider' in reference to his journey down the river in a barrel. Smaug took this to mean he was one of the Lake-men and vowed revenge for Bilbo's intrusion into his lair.
It was Harriet Tubman who helped the slaves escape.
The company isn't actually all with Gollum, only Bilbo. Bilbo uses the ring he picked up amid his wanderings to escape, which happened to be the one Gollum was looking for. It turns the wearer invisible.
Bilbo finds the ring that he later finds out belongs to Gollum who lost it. Gollum riddles with him in order to eat him, after bilbo asks him what is in his pocket he gets it after he helped bilbo get out of the mountain.
Bilbo, with the aid of his wits and his invisible ring.