I really like this game and have spent lot's of time on it. Right now I', playing as the Union at Colonel level difficulty, +2 AI activation, normal aggressiveness, no simple supply, +1 AI spotting and unit losses for moving (both me and AI). So here's a couple of the problems.
First I had captured Fayetteville and Springfield MO. There were no CSA depots anywhere near Springfield. I had it defended with an OK division of around 480 strength and a 3-1-1 general. There were in the city for at least 2 turns so had some entrenchment. So a CSA force of 1100 strength attacks it. I somehow lose the battle and the division, but not the standalone militia brigade gets kicked out of the city. I reenter it my turn and the CSA attacks it again the next turn and again the turn after that when they totally destroy the force.
My question is how did this CSA force stay supplied? It did have 2 4 unit wagon trains but each turn it would gain back so much cohesion that I was doomed.
Or the other example. I own Harper's ferry which is the east end of a rail line to Morgantown and Clarksburg. On the West end I also control the rail line. I have unit sin both cities with one division of just over 500 strength. The CSA moves to very large formations from Virginia. I assume one came through the mountains of West Virginia and attacked north while the other came from the Shenandoah valley and went west. Now they got there and it seemed like all that movement had no negative impact on cohesion for the AI units.
The attacked and destroyed all defending forces in 2-3 turns and then kept rampaging farther north up to Pittsburg where I did stop them.
Where were they getting these supplies from? How long can a 4 wagon train keep 2-3 divisions supplied? There is no way they had depots near there and it couldn't have been river transport because I captured all of Kentucky, took Nashville and had 6 groups of 4+ elements on OP stance all along the Mississippi and Ohio rivers.
How is the AI supporting these troops and why aren't they losing cohesion and hits for all their movement?
Heck I even found a brigade that somehow got all the way up to Boston. Maybe it landed there but it was running around for like 5 turns before I sent forces to kill it.