 In the early 1940s, the OKH Army Office under the leadership of General Olbricht became the focus of military resistance to the Nazi regime.In October 1943, Colonel Claus von Stauffenberg was transferred to the General Army Office as chief of staff.It was at the Bendlerblock that Stauffenberg and Major General Henning von Tresckow secretly modified the Wehrmacht "Operation Valkyrie" plan for the suppression of a possible revolt into a scheme for a coup attempt upon an assassination on Hitler.