 Marwan managed the Libyan-Egyptian deal as well as other highly-sensitive issues.Egypt had begun preparing a war with the aim of retaking the Sinai Peninsula that it had lost to the Israelis in the 1967 Six Day War.Marwan's unparalleled access to his nation's best-kept secrets, especially after his promotion in May 1971, allowed him to provide Israel with information about the coming war, including the full Egyptian war plans, detailed accounts of military exercises, original documentation of Egypt's arm deals with the Soviet Union and other countries, the Egyptian military Order of Battle, the minutes from meetings of the high command, accounts of Sadat's private conversations with other Arab leaders and even the minutes of secret summit meetings in Moscow between Sadat and Soviet leader Leonid Brezhnev.