Pelennor Fields is a level in The Lord of the Rings: The Return of the King. FIrst you have to finish off 60 soldiers. Then, you have to shoot down the Mumakill.

Though Aragorn, Legolas and Gimli are initially the only characters playable in this level, Frodo, Merry, Pippin and Faramir can fight in it as well once unlocked by cheat codes.