Summarization by the summarizer guy. -Drake's summary.

Thorin started a hunt for the Arkenstone, which Bilbo found in a previous chapter. He then left the mountain to try and trade the Arkenstone for peace, Thorin was very displeased by that action. Bilbo leaves the mountain. Dwarves, men, and elves almost fight, but turn against a common foe, the goblins. The Battle of Five Armies takes place (dwarves, men, elves, goblins, and wargs). Eagles come and save the day. Fili, Kili, and Thorin are lost, Bilbo faces a long trek home.