From January to June 1941, JG 2 and JG 26 were supported by other fighter wings. "Jagdgeschwader" 1 (JG 1—1st Fighter Wing), JG 51, "Jagdgeschwader" 52 (JG 52—52nd Fighter Wing), "Jagdgeschwader" 53 (JG 53—53rd Fighter Wing) and LG 2 were among those credited with successes against the Circus operations. From 9 to 21 June analysis attributes at least 18 specific Fighter Command losses to JG 26. On 22 June 1941, the German-led invasion of the Soviet Union left JG 2 and JG 26 the sole remaining fighter units in Western Europe. No. 2 Group RAF, Bomber Command, RAF Coastal Command supported by Fighter Command applied greater pressure in the West. Gustav Sprick and Galland downed two No. 145 Squadron RAF pilots on 18 June who became prisoner of war. Sprick was a Knight's Cross holder, but died in action just ten days later. On 10 July another Knight's Cross holder, Rolf Pingel, commanding II. "Gruppe" pursued a Short Stirling to the English coast, was hit and force-landed and promptly captured. His aircraft became the first Bf 109 F to be captured intact by the British. Fighter Command persisted with large-scale operations, but were suffering heavy casualties from the two German fighter wings. Eric Lock was among the casualties, posted missing on 3 August after strafing sortie (presumably ground-fire was the cause) and on 9 August Wing Commander Douglas Bader baled out and was captured. Galland entertained the famous pilot at JG 26 headquarters. The cause of Bader's capture occurred in the midst of combat with III. "Gruppe" commanded by Schöpfel. Galland, went through every report, even those of German pilots killed in the action, to determine Bader's victor. Each case was dismissed. RAF combat records indicate Bader may have been shot down by Flight Lieutenant "Buck" Casson of No. 616 Squadron RAF, who claimed a Bf 109 whose tail came off and the pilot out, before he himself was shot down and captured by Schöpfel. In the period 14 June–4 July Fighter Command lost 80 fighters and 62 pilots, while the two German wings lost 48 Bf 109s and 32 pilots; 2:1 in the Luftwaffe's favour.