Playing a game as Oda (almost said Tokugawa!) I have had four CTDs while firing a cannon at an enemy city.

What information can I provide to assist you? Feel free to PM me and I will provide a dxdiag or whatever you need,

Same, repeatable crash:

Select cannon unit, order it to prepare to fire (or do not, if it is already in place), press B, target enemy city.

'bout a 33% crash rate. I can recreate it right now, it will just take two shots.

Anything I can do to help!