Have you thought of some additional battles through DLC? Like the confederate attack at Fort Donaldson for the union?, or Wilson's Creek for the CSA, (This includes minor battles) Like Maybe add an additional major battle for pea Ridge because its early enough that the players armies would be about the size they were at the battle. Also the attack on fort Donaldson. Maybe an additional minor battle like Fort Marauder. Also why not have the battle of Ceder Creek, or the Battles of the Atlanta campaign?