The Battle of Five Armies

At the very end of the book, after Smaug dies, the dwarves of Dain come to the aid of Thorin and Co. because Bard did not want the other dwarves to come into the mountain. So began the Battle of Five Armies (dwarves, elves, men, eagles, goblins). At the beginning there was only the dwarves, men, and elves. Then the goblins came riding on the deadly wolves, Wargs, to avenge the Great Goblin who Gandalf killed. Then after the goblins came The Lord of the Eagles from the Misty mountains. Sometime later Beorn comes in his huge bear form and helps out a lot. He literally picks up a warg and squishes it! At the end of the battle it gets very very sad because the old mighty Thorin Oakinshield fights his last battle along with Fili and Kili, fellow dwarves. (One cool fact, Thorin is actually Fili and Kili's nephew because Thorin is their mom's eldest brother) so Bilbo got to go home to peace and so did the many fallen dwarves, elves, men, and goblins.  Thorin, Fili and Kili were the only ones dead out of the company of dwarves that took to such a long journey to the Lonely Mountain. Bilbo got a share of gold and went on his way home to The Shire.