By the siege of Constantinople in 1453, the Ottomans had large enough cannons to batter the walls of the city, to the surprise of the defenders. The Dardanelles Gun was designed and cast in bronze in 1464 by Munir Ali. The Dardanelles Gun was still present for duty more than 340 years later in 1807, when a Royal Navy force appeared and commenced the Dardanelles Operation. Turkish forces loaded the ancient relics with propellant and projectiles, then fired them at the British ships. The British squadron suffered 28 casualties from this bombardment.