Pelennor Fields - the Actual battle runs in a very Reinforcement based scenario, with one force defeating another, then another turning up, then another, and so on.
Unfortunately, Total war multiplayer does not agree with this, and so Two versions of the battle will be made, one for Single Player, and one for Multiplayer.
-Single Player
will run very much like the real battle, with reinforcements turning up after periods of time, until a large climax at the end with Mumakíl, Rohirrim and Orcs (Army of the Dead yet to be added, checking for balancing issues)
Only Mordor and Gondor will be playable, since Reinforcement armies are non-playable by players, hence this version not being used online.
Slightly Different Victory Conditions.
-Multiplayer
All armies are on the battlefield at once, Gondor, Mordor, Arnor/Free Peoples of Eriador, Rohan and Harad, meaning that ALL FIVE can be played, therefore making it suitable for a multiplayer game.
Five Factions (as stated above)
MP ONLY
Victory conditions are just "Destroy or Rout enemy"