I've had a few instances in the first year of the war where the AI has been behaving in a suicidal manner. Just bringing it to your attention in hopes that it might be addressable. These examples have been, in my experience, the exception rather than the rule, so it's not as if I can march my way straight to Savannah. . .
First, Ft. Pickens. Braxton Bragg has been throwing his command at that Ft. just about every turn since July '61. His losses have been staggering (1-2000 casualties PER BATTLE versus my <100 per battle). He must have thrown 10,000+ soldiers away at that fort.
Second, the ANV. They seem to have split up their forces and sent leaders off to conduct attacks of very limited value or chance of success. An example is TJ Jackson, who now commands a cavalry regiment, and went down to Ft. Monroe to attack the fort. By himself. His whole unit (994 soldiers) were killed, to my 6 losses.
Solution?: I'm have no idea how the AI does it's calculations, but it seems that it needs to be a little more mindful when calculating whether to attack - perhaps just a bit more conservative. Additionally, it might stand to benefit from knowing that it needs to create a "Death Star" army in the East to apply pressure (or the threat of it) to any opposing force.