Napoleonic : Total War II is a total conversion of Rome: Total War v1.5 in Napoleonic Era, featuring a lof of new historic factions and units, playable in multiplayer and singleplayer. There is too a playable campaign submod.
This is everyone fantasy to conquer the world, personally I like conquer Napoleon but with each unit have finely tuned soldiers that make shout for joy at every victory and push you can play as any unit and still be satisfied. However, there are elements of the game that were never finished or are quite broken and will never be fixed. Only play this with that in mind. Neither is there a campaign on the main download that works best but on an older version and while fun is sloppily done.