However, the first operational Beaufighters, equipped with Airborne Interception (AI) radar, proved their true worth as night fighters. In response to that threat, the RAF first deployed the Blenheim twin-engined night fighters, but they proved unable to effectively intercept the German bombers.
Bristrol's "Beaufighter" was one of the most successful and widely used twin engines fighter types during WW2. The first series production Beaufighter MK.1 entered service in September 1940. With its four nose-mounted 20mm cannons and six 7.7mm machine guns in the wings, this stub-nosed fighter became the most heavily armed aircraft in service with the RAF during the war.
The nose of the plane housed a special navigation system as well as an Al Mk.8 radar for surface and submarine detection. Starting in early 1944, the TF.Mk.Xs were deployed to Coastal Squadrons 144, 235 and 404.