 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.