Take Command - Second Manassas
Horse and Musket:

http://www.madminutegames.com/MadMin...forum.php?f=22

Basically it is a complete overhaul of the game to bring it into the Napoleonic Era (The game is a Realistic Civil War Tactical Simulation). I am a member of the team, so am somewhat biased, but it is one of only a few Tactical Napoleonic games out there and is truly epic in scale.