Medieval Massacre

In the Middle Ages, one of the scientists came up with a gun that will shoot lightning and smite any enemy who will wear a iron armor, as such there will be a lot, but as yet very few could think this gun it will destroy enemies but gradually! So you can call yourself to the aid of the archers who will stand at the barricades and do not give the enemy to destroy them, because this gun is very valuable and you can use it to grab any locks!