Just wanted to let you know about two new mods for the Total War series of games.
Empire Total War and Napoleon Total War has a mod or modification for the US Civil War called The Blue and the Gray. This mod has units based on actual regiments and brigades in the Civil War (Irish Brigade, Hoods Texans, Iron Brigade ect) They also have 12 pounder Napoleons, howitzers, mortars and others.
Very good mods. You can go to Youtube and look up etw civil war mod