After further testing it seems the problem is the ai commands/scripting stops. As soon as the gate is broken down the ladders which are being raised stop and hang in mid air and all units stop dead. I know from previous experience that as soon as the gate is broken down all units are told to attack the gate but it seems this command is either given but the troops dont know how to get to the gate or the whole ai command system crashes. If anyone know anything about ai commands that are given and how I can monitor this (RomeShell?) please post.