This seems like a basic question but how well do Invasion vs Invasion commander fights go? I'm currently doing a warfare-like mission where US Army controls all of southern Takistan and the Russians control the north split down the middle. I've had some real fun battles with this as both sides have 400 units (Active limiter is a frame rate saver) but I've seen some issues. The Ai commanders are so focused on the attack that once each side punches a hole through the frontline it just ends up as a bunch of troops in enemy territory with very little being done about it.

Has anyone ever done long term invasion on invasion commanders and do they eventually try to retake what they lose or will they just keep doing a blitzkrieg to the enemy base until one losses it's airport?

If anything I'll just switch the Russians to occupation but that kind of defeats the point of my mission.