Early model P-47 pilots practiced the dive and zoom at high altitude. Robert S. Johnson advocated a Barrel roll move, opposite to the arc of the turn, when pursued in a conventional turn if an enemy sat behind a P-47. This usually placed a P-47 behind its enemy. JG 26 claimed 44 American and British Commonwealth aircraft in June. JG 26 lost eight killed in action, one in an accident, one wounded in an accident and 10 others wounded in action. July costed the wing eight killed in action, five in accidents and nine wounded. On 13 August, III./JG 26 replaced IIII./JG 54 at Amsterdam Airport Schiphol. Two days later, the British began Operation Starkey. Airfields in the Pas de Calais were bombed but only two "Geschwaderstab" Fw 190s were damaged. JG 26 made 15 claims from 31 July to 15 August, 11 of which were accepted; most of the claims were B-17 Flying Fortress heavy bombers. From 9 to 15 August the wing suffered another three killed in action and four wounded. On 17 August 1943, I. "Gruppe" were scrambled by Walter Grabmann, a pre-war JG 26 group commander, and then Jafü-Holland, from Woensdrecht to combat the Schweinfurt–Regensburg mission. Several "gruppen" made contact with the bombers. 16 claims were confirmed by the German side to their pilots for five killed and six wounded. Among the notable fatalities was Major Wilhelm-Ferdinand Galland, brother of Adolf Galland, who fell in combat with the US 56th Fighter Group. The 353rd Fighter Group, three RAF squadrons and bomber crews accounted for the others. Karl Borris' I "Gruppe" made contact with the bombers and elements of 3./JG 26 attacked while Spitfires were present, losing two. After the Spitfires turned back, I. "Gruppe" was able to stay with the B-17s for much longer, though they were only able to account for four. Klaus Mietusch and III. "Gruppe" employed similar tactics, waiting for the US escorts to leave before beginning a 30-minute attack near Aachen claiming four but losing one and three more Bf 109s damaged against the unescorted bombers.