How do I fire cannons?

Combat is currently not implemented so the current answer is that you cannot fire them.

Bide your time and your trigger finger will get some exercise soon(tm).

Thanks
It will be awesome when it is implemented
War won't be Diplomatic
I hope it comes soon
That should be PRIORITY #1 on the staff's mind
Everyone of my friends asks me " how do i fight?"
Well they'll be dissapointed...
But, that's life for ya