Frederick "Fritz" Joubert Duquesne (/duːˈkeɪn/; 21 September 1877 – 24 May 1956), sometimes Du Quesne, was a South African Boer and German soldier, big-game hunter, journalist, and a spy.He fought on the side of the Boers in the Second Boer War and as a secret agent for Germany during both World Wars. He gathered human intelligence, led spy rings and carried out sabotage missions as a covert field asset in South Africa, Great Britain, Central and South America, and the United States.