Dutch guy, that's the exact problem I'm talking about. I don't know whether it's a bug or the AI evaluating that it shouldn't send all units with ladders to the walls. To me, it looks like a bug, as they'll often just sit there until the timer runs out.

If we could disable the AI from using ladders in a file somewhere, then the AI would only use siege towers and rams and at least would provide a bigger challenge when assaulting Stone walls. Does anyone have an idea whether this is possible from the files? I had hoped it might be as the AI can't use ladders against Epic walls (and consequently do much better as a result)...