Quote Originally Posted by MajorFreak
how did you get the men to the top? do they all climb once you hit stop? i don't get it.
You mean for firing from the tower? No, it's not your unit that fires, it's the tower itself, just like the stationary defending towers. All you need is to have the siege tower within range of an enemy unit on the walls.

Another tip I forgot: using onagers to kill one or two defending towers before moving in the siege towers is often effective. On the other hand, you don't want to destroy towers you will capture with your men soon anyway. It's a delicate balance between limiting own casualties in the first phase and keeping enemy casualties in the second phase up.