Detailed instructions were written for occupation of government ministries in Berlin, of Himmler's headquarters in East Prussia, of radio stations, of telephone exchanges, of other Nazi infrastructure through military districts and of concentration camps. (Previously, it was believed that Colonel Claus Schenk von Stauffenberg was mainly responsible for the Valkyrie plan, but documents recovered by the Soviet Union after the war and released in 2007 suggest that a detailed plan was developed by Tresckow in autumn 1943.) All documents were handled by Tresckow's wife, Erika, and by Margarete von Oven, his secretary. Both women wore gloves to leave no fingerprints.