Oh no! If Frog buys the game and starts writing strategy guides, what will happen to poor Eleanor?

LOL anyway, the AI is slightly better in that it no longer does totally pointless manuvers. However, the AI still cannot attack in a cohesive way. It's infantry line breaks apart before contact and the cavalry is rather haphazard.

Oh and the harder difficulties simply mean combat bonuses for the AI, they aren't actually smarter.