are there any patches to improve the AI when defending castles?

[Didz]

The thing that always makes me groan is the way the AI suddenly decides to abandon the walls and mass in the city centre as soon as you get a unit over them.

Its the dumbest move ever and usually results in several of their wall defence units getting slaughtered trying to withdraw. The one thing I've learnt from defending a city is that you don't abandon the walls. Instead, you make your wall defenders fight to the death trying to hold them and then you fight for every inch of the road from the wall to your city centre.

The classic is that very often after getting its men slaughtered abandoning the walls it then suddenly decides it wants them back and launches its surviving units back down the narrow street to try and retake the gatehouse. By which time of course I have every man who can throw a stick on the battlements and they end up acheiving nothing by re-carpeting the roadway in their bodies.