Air Gun "Ordonnanz"

The aircraft that looks like a machine gun which Ameru, a girl who ran about the battlefields?during the Ancient War, used. The principle of how it flew is not solved, but it is said that it used the power from the machine gun. It seems that this hypothesis is ridiculous, but the reason why this cannot be completely denied is because this gun could even destroy fortresses. It may be possible to blow a small girl easily.