Nota dr, but a side by side shotgun: A friend of my grandfather had been one of the minor German "Fighter Aces" of WW1 with 6 confirmed victories. "Uncle" HM was once shot down by a British observer with a shotgun. When he passed the enemy plane with his Albatross at short range, the second man raised from his seat and swung a double barrel shotgun at him. Being a hunter himself, he immediately knew he was done. He managed to escape and land his plane. But he had some indigestible buckshot in his stomach instead of a healthy breakfast. He survived the wounds and lived to an old age.

BTW, Ernst Udet (not Udett!) was the second high scoring German Ace with 62 victories, second only to the "ace of aces" Manfred v. Richthofen, 80 victories, see
https://en.wikipedia.org/wiki/Ernst_Udet