Still with No. 17 Squadron, Czernin fought with distinction throughout the Battle of Britain, tallying a Do 17 of II/KG2 on 12 July (shared), which crashed into the sea near a convoy off Orfordness. In the following month he shared a Ju 88 on 21 July and got three Bf 110s (including one shared) on 25 July. Later on, Czernin shot down two more Bf 110s on 3 September, a Bf 109Messerschmitt Bf 109 E-4 of JG.54, flown by Feldwebel Dettler. He baled out but his parachute failed to open. His body was found on Pitsea Marshes 12 days later. and two shared Heinkel 111s on 5 September, a Bf 110 on 11 September, a Ju 88 shared on 19 September and one more Bf 110 on 27 September and a Do 17 shared on 24 October.
