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Boromir says this article is "So small a thing. Such a little thing!" Please expand it if you can.
it was a trap door that made them fall into a small cage. when the Dwarves fell into the cage the goblin pulled them out and took them to their king who eventually was killed by Gandalf the Grey with his sword. while the defeat of the Goblin King was happening Bilbo had stolen the One Ring from Gollum and was making his may out while Gollum was looking for him, he escaped.