[Soyweiser]

Kref: The flying commanders ain't the problem. It is the sniper, who shoots your commanders. That one is the problem. Because he has the shoot commanders order.

So, I hear you think, bring more commanders. Sure that works, but having 10 spare indy commanders is kinda wasteful. A lot of that gold and upkeep is better spend on other stuff. (Same with the heavy inf, assuming your not using heavy inf in your normal arsenal). And collecting this stuff would also take a few turns.

All in all a pretty high investment to take back just one province.