I used to play Napoleonic Wars with Reddit Brigade. That was some of the most gaming fun I've ever had. The guys who made that are making a new game called Battle Cry of Freedom based on the US Civil War. It's been in development a long time so hopefully it comes out. I just donated and got access to the donator subforum.
http://fsegames.eu/index.html
http://fsegames.eu/index.html