I think the American Civil War is a little early for this. Maybe late Civil War? I see the Rifleman more as a WW1 trench fighter. As I see the Infantry more of a WW2 style unit.
No way man! The infantry is WWI! Bolt action rifles, heavy defence, reliance on artillery, slow moving, its all about WWI. WWII does lack a sort of infantry, but the Marines & Paratroopers kind of offer that, as they are flexible, WWII offered more flexibility.
I see the Rifleman as Napoleanic - US Civil War - Crimean - Franco/Prussian War era. From 1810 to 1900. Cavalry truely represent the traditional view of the era, but became very redundant whereas the foot soldier doesnt. Thats, it would be totally inconcievable to have a foot/horse unit for every stage of a timescale, especially after the Renaissance when so much changed in military ability so quickly.
There is a cool English Civil War mod with some amazing graphic designs of troops. Really old-post knights pre-cavalry guys with single shot pistols & lances! demi-lancers i think...
But other than including a load of mods, it would be really hard to accurately represent each war with an accurate unit. I think Civ represents each "era" with a unit that empitimises the military conflicts of the time. Hence the nice little quick moving industrial era...
- Rifleman (1800-1900)
- Infantry/Arty (1900-1960)
- Cruisers (1890-1970)
- Destroyers (1880-present)
- Battleships (1890-1944)
- Tanks (1935-1970)
- Airpower (1939-1955)
- Amphibious (1941-present)
- Airborne (1939-present)
- Mech Inf (1960-present)
Just roughly guessing there! I am playing a game currently where there is a naval arms race going on, I am at peace with most people, but there is a huge mix of alliances and I keep watching lots of battleships/destroyers leaving their cities! Its very interesting!