Ethan has given excellent advice.
The other option which is getting more of my attention these days is setting the generals to "high random" on their attributes. This greatly changes the settings for generals. Lee became a 6-2-7 in one of my games, Jackson was worse, but many of the other CSA generals were quite a bit better: Van Dorn was a 5-2-4 as I recall. It's not historical of course, but then, neither is the game you play once you deviate from the historical moves. I'm going to see if my next PBEM opponent will agree to try this. It throws a LOT of doubt into the decisions one must make in the game!