Hans Oster

(1888-1945) Hans Oster was a German Army officer in the First World War, a staff officer during the interwar period, and rose to become the main operations officer of the Abwehr military intelligence agency and a major figure in the German Resistance. He was dismissed for anti-Nazi activities, and eventually executed at Flossenburg Concentration Camp.

Oster committed to subvert the Nazis on 7 November 1939, when he gave the German plans for the invasion of the West to a Dutch military attache. "There is no going back after what I have done. It is much easier to take a pistol and kill somebody; it is easier to run into a burst of machine gun fire than it is to do what I have done." While the information he gave was correct, Dutch intelligence did not take the warning seriously; Hitler changed the invasion date twenty-nine times. He is believed to have been a major intelligence source for the Soviet Lucy Ring, as well as participating in efforts to rescue Jews.

In 1941, when Artur Nebe was assigned to command an Einsatzgruppe, he initially declined the assignment, asking to go to the International Police Commission. Ludwig Beck and Osterpersuaded him to go to the Einsatzgruppen to gather information.

On 5 April 1943, Manfred Roeder, an Army investigator into the Abwehr and the Red Orchestra, first discovered Oster's activities as part of a search at Abwehr headquarters, originally focused on the activities of Hans von Dohnanyi at the Vatican. As Dohanyi's safe was being searched in the presence of Oster and his chief, Admiral Wilhelm Canaris, with poor tradecraft they fumbled sensitive papers that Roeder and his Gestapo associate demanded. They discovered Oster's activities and forced his dismissal, initially as house arrest.

Oster was under arrest before the 1944 assassination attempt against Hitler, but was implicated and certainly was aware of the general conspiracy. Along with Canaris and Dietrich Bonhoeffer, he was shot at Flossenburg Concentration Camp in 1945.