 Claus Schenk Graf von Stauffenberg becomes an enemy of Hitler's policy, because Generalmajor Henning von Tresckow informs him about German war crimes behind the Russian front.On 20 July 1944 he goes with a time bomb in his briefcase to a conference room at Hitler's headquarter Wolfsschanze near Rastenburg in East Prussia.Four people were killed immediately, but Hitler survived.