In December 1943, the station was taken over by 100 Group, who brought 141 and 239 squadrons to RAF West Raynham. They were equipped with de Havilland Mosquito, fighter aircraft which provided support to bomber sorties in enemy air space. They were based at West Raynham until the end of the war; their duties involved flying Serrate patrols and "Ranger sorties" (seek and destroy enemy fighters in the air and on the ground). During the war, squadrons stationed at RAF West Raynham lost 56 Blenheims, 29 Mosquitos, and a Bristol Beaufighter.