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It is called the Battle of the Five Armies. There were men, elves, and dwarves on ones side, helped by the eagles and Beorn. The other side were the goblins and the wargs.
The Battle of Five Armies have the elves, dwarves and men on one side. The other side is the goblins and wargs. The eagles and Beorn also participate.
It was the Battle of Five Armies. The armies were the humans, elves and dwarves against the wargs and the goblins.
I'll assume this is about the Battle of the Five Armies. There are no "protagonists" that leave and come back only to fight, because technically, the protagonists in The Hobbit are Bilbo and the Dwarves. The only characters that come to the Battle that weren't there at the start and were encountered earlier, were the Eagles, and Beorn the Berserker.
In the Battle of Five Armies
Chapter 17, The Clouds Burst.
The HobbitThe Fellowship of the Ring, Book IThe Fellowship of the Ring, Book IIThe Two Towers, Book IThe Two Towers, Book IIThe Return of the King, Book IThe Return of the King, Book IIThe Silmarillion is another book that Tolkien also set in Middle-earth thousands of years before the first of the Hobbit books, but it is a history of the Elves and does not concern itself with Hobbits (except briefly in its final chapter where it reviews the events of the end of the Third Age from the point of view of the Elves, which differs slightly from the point of view of the Hobbits).
November 3, 2015
Approximately 144 minutes.
The battle of the five armies in "The Hobbit" starts when Thorin Oakenshield refuses to share the treasure with the other armies and a battle ensues over the mountain. The conflict escalates as different factions get involved, leading to a large-scale confrontation. Gandalf and Bilbo ultimately play crucial roles in helping to end the battle.
The battle took a turn in favor of the men, elves and dwarves when the eagles arrived. They threw the goblins off the mountain side.
The Fellowship of the Ring , The Two Towers and The Return of the King .