41 Squadrons led by Wing Commander Douglas Bader. The escort wing was 71, 222, and 111 squadrons from North Weald and the escort cover wing was 403, 603 and 611 from Hornchurch while Northolt Wing committed 306, 308 and 315. With thick cloud cover they abandoned the Gosnay operation and moved to a secondary target at Gravelines. The Luftwaffe provided severe resistance and large air battles developed over the coast. Finucane and 452 were positioned as the lower squadron in the Kenley Wing at 20,000 ft with Finucane leading 'A' Flight—a section of four Spitfires. Over Saint Omer at 11:32 Finucane engaged eight Bf 109s and with a long four-second burst of machine gun and cannon-fire from 100 yards one of the Messerschmitts caught fire and went into a spin. Finucane then shared two others with Keith Chisholm. The squadron lost three pilots—Jay O'Bryne became a prisoner of war while Barry Haydon and Geoff Chapman were shot down. Bader was also captured after being shot down by friendly-fire. Over the next few days 452 re-equipped with Spitfire VBs which had two Hispano-Suiza HS.404 calibre cannon in each wing to supplement four 7.7 mm (0.303 in) Browning machine guns. Finucane chose AB852 because it had the code W adorned on the fuselage. The Spitfire that Finucane damaged in the collision with Dutton earlier also had this letter. Superstition compelled him to fly with a W-decorated fighter for good luck. On Saturday 16 August 1941 Finucane celebrated his greatest success in this machine. Circus 73 began at 07:25, and once again the wing was sent to Saint Omer. Near Gravelines eight to ten Bf 109s engaged 485 squadron. At the customary 100 yards a two-second burst—his second—put the first enemy aircraft into a spin. Pilot Officer Truscott witnessed it diving steeply at 1,000 ft and spinning. At midday 452, 602 and 485 participated in Circus 74 but made no claims. At 17:45 Circus 75 yielded another response from the Luftwaffe. Kenley performed the role of escort wing. Eight Bf 109s engaged at 9,000 ft and 452 claimed seven. Finucane engaged one which caught fire and emitted a lot of white smoke. He then opened fire on another from 10 yards after his gun sight failed. The Bf 109 lost its tail unit. The day's successes were victory numbers 9, 10 and 11. On 19 August Circus 81 once again targeted the Gosnay