Gray -
Per our discussion about Isaac Stephens (kia Chantilly, 9/62), I've continued researching a historical setup for northeastern Florida in the 1863 campaign.
Union:
Ft Clinch
Ft Marion - 7th CT Volunteers (Col. Hawley) + 1 lt. battery
St Augustine
Jacksonville (no depot) - 1st SC Volunteers (Col. Higgenson) [Colored Militia or Volunteers], 2nd SC Volunteers (Col. Montgomery) [Colored Militia or Volunteers], 8th ME Volunteers (Col. Rust), 6th CT Volunteers (Maj. Meeker), 1 gunboat squadron (USS John Adams, USS Uncas, USS Norwich, USS Burnside - under Commander Duncan), 1 10 lb. Parrot cannon, 2 8" Boat Howitzers.
The commanding general of these forces, Rufus Saxton, remained at Beaufort. Col. Higgenson was in field command. Based on regimental reputation, I favor colored militia designation for the 2nd SC (planning ahead for when we differentiate combat values between colored militia and colored volunteers). USS Burnside wasn't really a gunboat, but the rebels thought it was, and it fills out the squadron.
Confederate:
all other regions
on the railroad west of Jacksonville (Baldwin?) - Florida Volunteers (Br. Gen. Finnegan) [Mounted Infantry], 1 32 lb. Blakely cannon (rifled to 64 lb.) "Jacksonville Steam Gun" or just "Railroad Battery"
That last was apparently an armored railway gun. Finnegan didn't have any other artillery. I have no idea how it would best be represented in the game.
Sources include Army Life in a Black Regiment by Higgenson - pp. 132-177; and The First "Steam" Gun in Action - The Journal of the American Military History Foundation, Vol. 2, No. 3 article by T. Davis - pp. 172-174