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
Josef Jakobs the 4th Foot Guards. In June 1940, ten months after the outbreak of the Second World War, Jakobs was drafted into the "Wehrmacht" as an "Oberleutnant". However, when it was discovered that he had been imprisoned in Switzerland from 1934–37 for selling counterfeit gold, he was forced to resign his commission in the Wehrmacht. Jakobs was demoted to a "feldwebel" (NCO) and placed in the "Meteorologischen Dienst" (meteorological service) of the German Army. Shortly afterwards, he also began working for the Abwehr, the intelligence department of the German Army. On 31 January 1941, Jakobs was flown from Schiphol Airport in