Which battle in J.R.R. Tolkien's The Hobbit involves five armies?

The Battle of Five Armies is the battle in J.R.R. Tolkien’s The Hobbit involving five armies.

The battle takes place near the Lonely Mountain after the death of Smaug. Dwarves, Elves, and Men confront one another over the treasure of Erebor, but the arrival of Orcs and Wargs changes the conflict into a wider alliance against a common enemy.

The five armies are generally identified as the Dwarves, Elves, Men, Orcs, and Wargs. Tolkien’s narrative emphasizes that the conflict is not simply a contest over treasure: the larger threat from the Orcs forces former rivals to fight together.

The battle is a major turning point in The Hobbit. Thorin Oakenshield is mortally wounded, Bilbo is knocked unconscious, and the victory reshapes the political balance around the Lonely Mountain. It is distinct from the later battles described in The Lord of the Rings.