300: Persian army vs Armies of Sauron
The entire Persian army in 300 vs all of Sauron's forces in every movie combined (no Balrog or Dragon, tho).
Xerxes has the ring inside a magic box that prevents anyone from being influenced by it. He plans to toss the ring inside Mount Doom to destroy it once and for all.
Sauron is at the height of his powef and ressurects all the dead minions from all 6 movies (the Hobbit included) to stop Xerxes.
Who wins?