Oberst Claus Philipp Maria Justinian Schenk Graf von Stauffenberg (; 15 November 1907 – 21 July 1944) was a German army officer who is best known for his failed attempt on 20 July 1944 to assassinate Adolf Hitler at the Wolf's Lair, part of Operation Valkyrie, a plan that would have seen the arrest of the Nazi leadership in the wake of Hitler's death and an earlier end to World War II. Wikipedia