The "Enders Royal" name is associated with Shapleigh Hardware of St Louis, and Crescent was one of the several manufacturers. "Cannon Breech-Simmons Hardware Co" is found on single shot guns made by J. Stevens Arms Co.
But I cannot locate any information that indicates a shotgun was made with both of these trade names.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.