I am sorry if I have missed some basic thing and this question sounds silly, but I cant seem to be able to build cannons, although I have built a Bell Foundry. I have picked up Medieval after couple of years and remember well how my artillery smashed unbelievers and was looking forward to bombing fun again.
According to data sheet that came with my copy of the game, i should be able to build mortars and bombards with Bell Foundry, however, there is no such thing in units screen

Am I missing something and some other structures need to be built first? or is it a glitch, and i should try reinstalling the game? I`ve patched version 1.1 of M:TW.