He succeeded Balthasar for the second time as JG 2 commander, who had died in combat with Spitfires over northern France when he pulled the tail off his Bf 109F in a dive. The Bf 109F-2 proved an excellent match to the Spitfire V, but Oesau disliked its reduced armament compared to the 'Emil', and continued to fly an E-4 model in preference to the Bf 109F, until lack of spares forced him to switch to the newer variant. Upon his appointment on 4 July 1941, he addressed JG 2 with the following words.