Josef Jakobs SW3, on 4–5 August 1941. The trial was held "in camera" because the German agent had been apprehended in a highly classified intelligence operation known as the Double Cross System. The British were aware that Jakobs was coming because his arrival information had been passed on to MI5 by the Welsh nationalist and "Abwehr" double agent Arthur Owens. After a two-day trial which involved hearing the testimony of eight witnesses, Jakobs was found guilty of spying and sentenced to death. Jakobs's execution took place at the miniature rifle range in the grounds of the Tower of London on 15 August
RAF Upwood by another medium bomber unit, No. 35 Squadron, flying both Blenheims and Ansons. Both Upwood squadrons were not destined to see front-line combat as, on 8 April 1940, they were merged into the new No. 17 Operational Training Unit RAF and tasked with training aircrews. Although the Upwood units were not taking a direct part in the war, they did see some action. On two occasions in 1940 and once in 1942 the airfield was attacked by Luftwaffe aircraft. However, only one person was killed during these raids. On 1 February 1941 a German spy, Josef Jakobs, was captured by