 Complete the following phrase:  On 5 July, Mietusch arrived at Cuxhaven-Nordholz Airfield where III. Gruppe was based and took over command from Hermichen. In July, the Gruppe received the Bf 109 G-4 and G-6 variants and the pilots began familiarizing themselves with this aircraft type while flying in Defense of the Reich. On the night of 2425 July, the RAF and USAAF launched Operation Gomorrah, the attack on Hamburg during the last week of July 1943. The RAF initiated the attack at night which created a firestorm in the city. The following day, the USAAF attacked Hamburg with 100 B-17 bombers, spreading the destruction. Further 118 B-17 bombers bombed Kiel that day. Defending against these attacks, Mietusch claimed his first aerial victory as Gruppenkommandeur when he shot down a B-17 north of Hamburg. The USAAF targeted the German aircraft industry on 17 August in the 