On 20 July 1944, an attempt was made to assassinate Adolf Hitler, Führer of the Third Reich, inside his Wolf's Lair field headquarters near Rastenburg, East Prussia. The plot was the culmination of the efforts of several groups in the German Resistance to overthrow the Nazi-led German government. The failure of both the assassination and the military coup d'état which was planned to follow it led to the arrest of at least 7,000 people by the Gestapo. According to records of the Führer Conferences on Naval Affairs, 4,980 of these were executed, resulting in the destruction of the organised resistance movement in Germany for the remainder of World War II.
Since 1938, conspiratorial groups planning an overthrow of some kind had existed in the German Army (Wehrmacht Heer) and in the German Military Intelligence Organization (Abwehr). Early leaders of these plots included Brigadier-General Hans Oster, General Ludwig Beck and Field Marshal Erwin von Witzleben. Oster was the deputy head of the Military Intelligence Office. Beck was a former Chief-of-Staff of the German Army High Command (Oberkommando des Heeres, OKH). Von Witzleben was the former commander of the German 1st Army and the former Commander-in-Chief of the German Army Command in the West (Oberbefehlshaber West, or OB West). They soon established contacts with several prominent civilians, including Carl Goerdeler, the former mayor of Leipzig, and Helmuth James Graf von Moltke, the great-grandnephew of the hero of the Franco-Prussian War.