JG 2 participated in the "Luftwaffe" air cover of the Channel Dash. Two Boeing B-17C Flying Fortresses of No. 90 Squadron attacked the German battleships and . In one of the highest altitude interceptions of World War II, the bombers were attacked by I./JG 2, resulting in the destruction of one. This aircraft put JG 2's score past the 800 mark, matching the score of their Great War namesake. Kills No. 88 to 92 were all Spitfires claimed between Calais and Dungeness on 12 August 1941. Oesau claimed his 100th kill on 26 October 1941, the third pilot to do so. This earned him his 4th entry in the "Wehrmachtbericht".