In the German night bombing raid on London, 18 June 1940, Blenheim night fighters accounted for five German bombers thus proving they were better suited in the nocturnal role. In July, No. 600 Squadron, by then based at RAF Manston, had some of its IFs equipped with Airborne Interception (AI) Mk. III radar. With this radar equipment, a Blenheim from the Fighter Interception Unit (FIU) at RAF Ford achieved the first success on the night of 2/3 July 1940, accounting for a Dornier Do 17 bomber. More successes came and, before long, the Blenheim was to prove invaluable in the night fighter role. Gradually, with the introduction of the Bristol Beaufighter in 1940–41, its role was supplanted by its faster, better armed progeny.