Wuxuu ku dhashay Austria sanadkii 1918 wuxuuna ka shaqeynayay rootiga ilaa da'diisii qaangaarka ee Bartels wuxuu ku biiray "Luftwaffe" kadib midowgii Jarmalka ee Austria 1938. Bartels wuxuu tababarkiisa duuliye ahaan ku dhameystay 1941. Waxaa loo qoondeeyay "Jagdgeschwader" 26 "Schlageter" (JG 26<unk>26th Fighter Wing) oo ku taal Channel Front
kaas oo loo xilsaaray in uu qabsado duulaanka Royal Air Force (RAF) ee Faransiiska iyo Belgium. Wuxuu gaaray guushiisii ugu horeysay ee hawada bishii Agoosto 1941. Bartels waxaa loo wareejiyay "Jagdgeschwader" 5 (JG 5<unk>5th Fighter Wing) oo ku taal Bariga hore halkaas oo lagu gudoonsiiyay Knight's Cross of the Iron Cross 46 guul oo hawada ah. Sanadkii 1943 Bartels wuxuu u wareegay "Jagdgeschwader" 27 "Afrika" (JG 27<unk>27th Fighter Wing) si uu ugu adeego goobaha dagaalka ee Mediterranean iyo Balkans dhamaadkii sanadka wuxuu lahaa 73 guul. Sanadkii 1944 wuxuu ku soo laabtay dhanka Galbeedka wuxuuna la dagaalamay Ololaha Normandy bishii Juun ilaa Agoosto 1944. Bartel ayaa shaqsi ahaan u helay 96 waxaana loo magacaabay Oak Leaves ee Knight's Cross.