The defenders did not properly guard the city walls in time, in all cities/castles. This damn bug makes Cities/castles easy to capture. you sucks ruins the excellent part of the game---seige.
Summary:
In seige, only a few defender aechers shoot. Especially, when attackers climb the laders, almost all defender archers do not shoot any more. They are just standing on the wall and watching, like a bunch of idiots waiting to be slaughtered. This problem is important and critical, since...