World War I ended six weeks later, without reply by Germany to the United States response. There is no record of any subsequent capture by German forces of any U.S. soldier or marine armed with a shotgun or possessing shotgun ammunition, or of Germany carrying out its threat against the U.S. soldiers it captured earlier.
The civilised soldier when shot recognises that he is wounded and knows that the sooner he is attended to, the sooner he will recover. He lies down on his stretcher and is taken off the field to his ambulance, where he is dressed or bandaged by his doctor or his Red Cross Society, according to the prescribed rules of the game as laid down in the Geneva Convention. Your fanatical barbarian, similarly wounded, continues to rush on, spear or sword in hand; and before you have had time to represent to him that his conduct is in flagrant violation of the understanding relative to the proper course for the wounded man to follow, he may have cut off your head.