110 aircraft of Nos 1 and 100 Groups carried out extensive bomber-support operations: 24 'Airborne Cigar' (ABC)-equipped Lancasters of No 101 Squadron patrolled all likely night-fighter approaches, so that their German-speaking operators could jam the German controllers' instructions; No 100 Group flew 34 RCM sorties and 27 Serrate and 25 Intruder Mosquito patrols. 2 Intruders and 1 ABC Lancaster were lost.
58 aircraft of Nos 3 and 5 Groups carried out a variety of operations to conceal the true location of the invasion for as long as possible. 16 Lancasters of No 617 Squadron and 6 G-H fitted Stirlings of No 218 Squadron dropped a dense screen of Window, which advanced slowly across the Channel, to simulate a large convoy of ships approaching the French coast between Boulogne and Le Havre, north of the real invasion coast. These flights required exact navigation; both squadrons had been practising for this operation for more than a month. The second diversion was carried out by 36 Halifaxes and Stirlings of Nos 90, 138, 149 and 161 Squadrons. These aircraft dropped dummy parachutists and explosive devices to simulate airborne landings over areas not being invaded. 2 Stirlings of No 149 Squadron were lost while carrying out this duty.
31 Mosquitos bombed Osnabrück without loss.
Total Bomber Command effort for the night: 1,211 sorties, 8 aircraft (0.7 per cent) lost. The number of sorties flown was a new record. British, American and Canadian divisions landed on five Normandy beaches early the next morning."