On 4 July 1940, 101 Squadron saw action for the first time. Individual aircraft attacked oil tanks in German ports. This went on for over a year, and during this time the squadron lost 15 Blenheims across 610 missions. No. 101 Squadron was transferred to 3 Group and consequently left West Raynham. They were replaced at West Raynham by 114 Squadron, another detachment of Blenheims. They were stationed at West Rayham for over a year before they were despatched to North Africa as part of "Operation Torch". The squadron converted to Blenheim Mk Vs in August 1942, in preparation for combat in Africa. No. 18 Squadron also went to RAF West Raynham to be refitted with Mk Vs. At this time, squadrons 180 and 342 were formed at West Raynham. The 180 Squadron was equipped with North American B-25 Mitchells and based at RAF Great Massingham which was associated with RAF West Raynham. Squadron 342 was provided with Douglas Bostons crewed by Frenchmen in early 1943, and was later relocated to RAF Sculthorpe.