please, you think you can build a city sized cannon and NOT have them notice, especially when you almost certainly used beast people as slaves to acquire the materials if not also to build it? hell, even if you didn't use beasts at all for "secrecy and security sake" how absolutely retarded must one be to fail to notice a mortal enemy building a weapon of that caliber? I'm 100% certain they'll see it coming and have a counter ready or even preemptively destroy it