The Idea

-Two players fight each other at the time of the second Punic War. One leads Rome, the other one Carthage.

-If for example Carthage attacks a Spain army, the battle will be fought between the human players nevertheless. In this case the player who leads Rome would fight for Spain - because it's Romes aim to defeat Carthage he'll fight as good as possible.
=> Because of that reason the players will never fight against the AI.

Do you like this idea? Is it possible to make such a mod? I'm not a modder, so I don't know.