I have that problem a lot too. The way I fix it, is to double click on the wall top, stop them so a bunch of troops sort of 'spread' into the tower and you can get them to climb it. Problem mostly solved. Just keep on repeating it.
But thats a shitty way to play. Forget siege towers as a means to mount the wall. I just use them to wipe out the defenders. Onagers and sap points are what I use to destroy walls.
My strategy for taking a town is to make as many holes in the wall as possible and assault them simultaneously.
The more holes in the wall, the better you can take the city.
No bypassing the swear filter.
-yak
Sir, I have not yet begun to defile myself.
Swallow my pride? No thank you, Im too full of myself.
I bring you nothing but love and a shopping bag full of sexual depravity.
I hate to advocate drugs, alcohol, violence or insanity to anyone, but they've always worked for me.
Tied with Meteora (****er) for Best Sig Award.
[This message has been edited by yakcamkir (edited 09-21-2006 @ 04:44 AM).]