[1] He was caught still wearing his flying suit and carrying £500 in British currency, forged identity papers, a radio transmitter and a German sausage.

[2] On his person was also found a photo purportedly of his lover, a German cabaret singer and actress named Clara Bauerle (1905–1942), who became a spy because she had spent a few years performing in the West Midlands and could speak English with a Birmingham accent.

[1] Jakobs's court martial took place in front of a military tribunal at the Duke of York's Headquarters in Chelsea, London 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.

Eight soldiers from the Holding battalion of the Scots Guards, armed with .303 Lee–Enfields, took aim at a white cotton target, about matchbook size, pinned over Jakobs's heart.

[9] Following the execution, Jakobs's body was buried in an unmarked grave at St Mary's Catholic Cemetery, Kensal Green, London.