In 1943, having recovered from a severe wound he had suffered on the Eastern Front, Haeften became adjutant to Oberstleutnant Claus von Stauffenberg, one of the leading figures in the German Resistance. On 20 July 1944, Haeften accompanied Stauffenberg to the military high command of the Wehrmacht near Rastenburg, East Prussia where Stauffenberg planted a briefcase bomb in a conference room at Hitler's Wolfsschanze headquarters.
As Colonel Claus von Stauffenberg on 20 July 1944 an assassination attempt on Adolf Hitler in his "leader" headquarters "Wolf's Lair" and shortly afterwards took his co-conspirators in Berlin Bendlerblock "Operation Valkyrie" triggered.......................via 20juli1944.de
Adolf Hitler is seen nursing his arm soon after the July 20, 1944 attempt on his life at the Wolf's Lair (“Wolfsschanze“) military headquarters near Rastenburg in East Prussia (now Kętrzyn in Poland). With him are (from left) Wilhelm Keitel, Hermann Göring, and Martin Bormann. The complex was one of several Führerhauptquartiere (“Führer Headquarters”) in various parts of occupied Europe, and it was built for the start of Operation Barbarossa, the invasion of the Soviet Union, in 1941.
Generalmajor Heinz Brandt (11 March 1907 – 21 July 1944). On 13 March 1943 Generalmajor Henning von Tresckow asked Brandt to carry a package containing bottles of what he claimed was cognac onto Hitler's Condor plane for delivery to Oberst Helmuth Stieff as payment for a lost bet. The package in fact contained a primed bomb which in the event failed to detonate.