Tower of London at the Tower was German spy Josef Jakobs who was shot on 15 August 1941. The executions for espionage during the wars took place in a prefabricated miniature rifle range which stood in the outer ward and was demolished in 1969. The Second World War also saw the last use of the Tower as a fortification. In the event of a German invasion, the Tower, together with the Royal Mint and nearby warehouses, was to have formed one of three "keeps" or complexes of defended buildings which formed the last-ditch defences of the capital. The Tower of London has become
Josef Balabán that had been organized by former army officers. Beginning in the summer of 1939 he was one of the leaders of the organization. Together with Josef Mašín and Václav Morávek, Balabán was part of the group known as the Three Kings ("Tři králové"), which carried out intelligence gathering and sabotage. The group continued in communication with Paul Thümmel (agent A-54), a Nazi intelligence officer also working as a spy for Czechoslovakia. The most visible acts of sabotage were two bomb attacks carried out in Berlin: one in January 1941 against the Ministry of Air Travel ("Reichsluftfahrtministerium") and police headquarters, and