Pedzisa mutsara unotevera: Akaberekerwa muAustria muna 1918 uye achishanda somubiki kusvikira makore ake okupedzisira okuyaruka Bartels akabatana ne"Luftwaffe" pashure pokubatanidzwa kweGermany neAustria muna 1938. Bartels akapedza kudzidziswa kwake kuva mutyairi wendege muna 1941. Akagoverwa ku "Jagdgeschwader" 26 "Schlageter" (JG 26<unk>26th Fighter Wing) pa
Channel Front yaive nebasa rekubata maRoyal Air Force (RAF) kupindira pamusoro peFrance neBelgium. Akawana kukunda kwake kwokutanga mumhepo muna August 1941. Bartels akaendeswa ku "Jagdgeschwader" 5 (JG 5<unk>5th Fighter Wing) kuEastern Front kwaakapihwa Knight's Cross yeIron Cross yekukunda kwe46 mumhepo. Muna 1943 Bartels akaendeswa ku "Jagdgeschwader" 27 "Afrika" (JG 27<unk>27th Fighter Wing) kunoshanda muMediterranean neBalkan theaters uye pakupera kwegore aive nekukunda makumi manomwe nenomwe. Muna 1944 akadzokera kuWestern Front ndokurwa muNormandy Campaign muna June kusvika August 1944. Nhamba yaBartel pachake yakakwira kusvika ku96 uye akasarudzwa nokuda kweOak Leaves of the Knight's Cross.