Constantine couldn't pay the price that he asked for his cannon. So urban then turned around and sold his cannons to the Ottomans. The largest of these was nine meters long with the mouth of the cannon being one meter across. When it was when it was fired, this thing could fire a ball weighing 500 kilograms over a kilometer and a half. It took such a huge, stupid amount of time to cool. This thing could only be fired seven times over the course of one day. And way more was going to happen as time goes on.