Quote Originally Posted by Silencer
and what about the numbers of siege weapons, how is it defined?
According to reviews and footage, you have to build some of them when you attack a siege, at least some of the weapons (like ladders, sapping tunnels, siege towers and presumably also battering rams) and some of them (ornagers and other long range artillery) will be have to build in advance (but these have a function in all battles, not just sieges. ladders are pretty useless unless you are besieging a town )