Operation Valkyrie - The "July Plot" to Assassinate Hitler (July 20, 1944) At the end of 1943 the Schutz Staffeinel (SS) and the Gestapo managed to arrest several Germans involved in plotting to overthrow Adolf Hitler. This included Dietrich Bonhoeffer, Klaus Bonhoeffer, Josef Mueller and Hans Dohnanyi. Others under suspicion like Wilhelm Canaris and Hans Oster were dismissed from office in January, 1944. Major Claus von Stauffenberg now emerged as the leader of the group opposed to Nazi rule. In 1942, he decided to kill Adolf Hitler. He was joined by Wilhelm Canaris,Carl Goerdeler, Julius Leber, Ulrich Hassell, Hans Oster,...