After winning, I like to back up a couple turns and try a comeback with the other side.
I've noticed that it doesn't seem like the AI is buying replacements for any units. The F2 replacement pop-up is way in the red, and a lot of brigades are missing elements.
I thought perhaps it was because I was playing with automated replacements off, but I just tried it again in a game set to 15% replacements, and again the AI had nothing.
This seems broken. And a cheap way to win- I'll end up in battles facing regiments that are almost wiped out, so its really easy to wipe out regiments and get big NM boosts in battles that should be closer.