Mezue ahịrịokwu na-esonụ: A mụrụ ya n'Austria na 1918 ma rụọ ọrụ dị ka onye na-eme achịcha ruo mgbe ọ dị afọ iri na ụma, Bartels sonyeere "Luftwaffe" mgbe Germany jikọtara ya na Austria na 1938. Bartels gụsịrị ọzụzụ ya dị ka onye na-anya ụgbọelu na 1941. E kenyere ya na "Jagdgeschwader" 26 "Schlageter" (JG 26<unk>26th Fighter Wing) na
Channel Front nke e kenyere ọrụ ịnagide mwakpo nke Royal Air Force (RAF) n'elu France na Belgium. O nwetara mmeri mbụ ya n'elu ụgbọelu n'August 1941. A kpọfere Bartels na "Jagdgeschwader" 5 (JG 5<unk>5th Fighter Wing) na Eastern Front ebe e nyere ya Knight's Cross nke Iron Cross maka mmeri 46 nke ikuku. Na 1943 Bartels kwagara "Jagdgeschwader" 27 "Afrika" (JG 27<unk>27th Fighter Wing) ije ozi na Mediterranean na Balkans ebe nkiri na site na njedebe nke afọ nwere mmeri 73. Na 1944 ọ laghachiri na Western Front ma lụọ agha Normandy na June ruo August 1944. Ọnụ ọgụgụ Bartel onwe ya ruru 96 ma họpụta ya maka Oak Leaves nke Knight's Cross.