Zorner had to wait several weeks for another successful engagement. On 18 August 1943 Bomber Command carried out Operation "Hydra", an attack on the Peenemünde Army Research Center. At 01:53 over the Baltic Sea Zorner claimed a Lancaster followed by another Lancaster over Peenemünde at 02:03—his 13th victory. It was his last victory with 3./NJG 3. On 9 September 1943 he was appointed "Staffelkapitän" of 8./NJG 3.