Can anybody tell me anything about the 15 Korps, such as battles, location formed, etc? The marking was found penned in on the rear of the stock harness of a World War 1 bringback C-96 Mauser. Also penned in on the rear of the harness is the name "Gefr. Fendler". The pistol is a wartime commercial 7.63mm. The harness was made by Oskar Scheyhing in Cassel in 1916. Thanks for any battle history in the First World War.