Here's a Mod that Came out Recently. It's called Sparta Total War. It only has Custom battle, and one Historical Battle, The Battle of Thermapalye (Sorry if I spelt it wrong) It's only 10-10.5 MB's.
Here's is a link http://www.twcenter.net/forums/showt...=304337&page=2.
It adds two new Units. The Immortals, and Spartans. The Models take after The Movie "300" and the Historical Battle is at the part of the movie When the Immortals Attack.