There, one of Stauffenberg's superiors was General Friedrich Olbricht, a committed member of the resistance movement. The had a unique opportunity to launch a coup, as one of its functions was to have Operation Valkyrie in place. This was a contingency measure to let it assume control of the in the event that internal disturbances blocked communications to the military high command. The "Valkyrie" plan had been agreed to by Hitler but was secretly changed to sweep the rest of his regime from power in the event of his death. In 1943, Henning von Tresckow was deployed on the Eastern Front, giving Stauffenberg control of the resistance. Tresckow did not return to Germany, as he committed suicide at Królowy Most, Poland in 1944, after learning of the plot's failure.