Okay, cool. I have a player that is super into PFC and I was making sure that my idea for a nightwave that lurks under the icecap in the summer, revels in the endless night of winter, and is slowly, secretly building an army of undead frozen in the ice to be unleashed as a massive invasion when they finally reach the cap's edge wouldn't clash with anything.
I am disappointed that the cannon thing means I have to scrap my whole "Prussian War on Ice" story line.