The Abwehr (German for resistance or defence, though the word usually means counterintelligence in a military context; ˈapveːɐ̯) was the German military-intelligence service for the Reichswehr and the Wehrmacht from 1920 to 1945. Although the 1919 Treaty of Versailles prohibited the Weimar Republic from establishing an intelligence organization of their own, they formed an espionage group in 1920 within the Ministry of Defence, calling it the Abwehr. The initial purpose of the Abwehr was defence against foreign espionage: an organizational role which later evolved considerably. Under General Kurt von Schleicher (prominent in running the Reichswehr from 1926 onwards) the individual military services' intelligence units were combined and, in 1929, centralized under Schleicher's Ministeramt within the Ministry of Defence, forming the foundation for the more commonly understood manifestation of the Abwehr.
Each Abwehr station throughout Germany was based on the local army district (Wehrkreis); more offices opened in amenable neutral countries and (as the greater Reich expanded) in the occupied territories. On 4 February 1938, the Ministry of Defence—renamed the Ministry of War in 1935—was dissolved and became the Oberkommando der Wehrmacht (OKW) with Hitler in direct command. The OKW formed part of the Führer's personal "working staff" from June 1938 and the Abwehr became its intelligence agency under Vice-Admiral Wilhelm Canaris. The Abwehr had its headquarters at 76/78 Tirpitzufer (the present-day Reichpietschufer) in Berlin, adjacent to the offices of the OKW.
The Abwehr was created in 1920 as part of the German Ministry of Defence when the German government was allowed to form the Reichswehr, the military organization of the Weimar Republic. The first head of the Abwehr was Major Friedrich Gempp, a former deputy to Colonel Walter Nicolai, the head of German intelligence during World War I, who proved mostly ineffectual. At that time it was composed of only three officers and seven former officers, plus a clerical staff.
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The Oster Conspiracy (Septemberverschwörung) of 1938 was a proposed plan to overthrow German Führer Adolf Hitler and the Nazi regime if Germany went to war with Czechoslovakia over the Sudetenland. It was led by Generalmajor Hans Oster, deputy head of the Abwehr and other high-ranking conservatives within the Wehrmacht who opposed the regime for behavior that was threatening to bring Germany into a war that they believed it was not ready to fight.
The Gleiwitz incident (Überfall auf den Sender Gleiwitz; Prowokacja gliwicka) was a false flag attack on the radio station Sender Gleiwitz in Gleiwitz (then Germany and now Gliwice, Poland) staged by Nazi Germany on the night of 31 August 1939. Along with some two dozen similar incidents, the attack was manufactured by Germany as a casus belli to justify the invasion of Poland. Prior to the invasion, Adolf Hitler gave a radio address condemning the acts and announcing German plans to attack Poland, which began the next morning.
The People's Commissariat for Internal Affairs (PCIA) (Narodný komissariat vnutrennih del (NKVD), nɐˈrod.nɨj kə.mjɪ.sə.rjɪˈat ˈvnut.rjɪ.njɪx̬ djel), abbreviated NKVD (НКВД ), was the interior ministry of the Soviet Union. Established in 1917 as NKVD of the Russian Soviet Federative Socialist Republic, the agency was originally tasked with conducting regular police work and overseeing the country's prisons and labor camps. It was disbanded in 1930, with its functions being dispersed among other agencies, only to be reinstated as an all-union commissariat in 1934.