President Richard Nixon, Soviet leader Leonid Brezhnev had proposed Israel pull back to its 1967 border. Brezhnev said that if Israel did not, "we will have difficulty keeping the military situation from flaring up"—an indication that the Soviet Union had been unable to restrain Sadat's plans. Between May and August 1973, the Egyptian Army conducted military exercises near the border, and Ashraf Marwan inaccurately warned that Egypt and Syria would launch a surprise attack in the middle of May. The Israeli Army mobilized with their Blue-White Alert, in response to both the warnings and exercises, at considerable cost. These exercises led some Israelis to dismiss the actual war preparations, and Marwan's warning right before the attack was launched, as another exercise. In the week leading up to Yom Kippur, the Egyptian army staged a week-long training exercise adjacent to the Suez Canal. Israeli intelligence, detecting large troop movements towards the canal, dismissed them as mere training exercises. Movements of Syrian troops towards the border were also detected, as were the cancellation of leaves and a call-up of reserves in the Syrian army. These activities were considered puzzling, but not a threat because Israeli intelligence suggested they would not attack without Egypt and Egypt would not attack until the weaponry they wanted arrived. Despite this belief, Israel sent reinforcements to the Golan Heights. These forces were to prove critical during the early days of the war. On September 27 to 30, two batches of reservists were called up by the Egyptian army to participate in these exercises. Two days before the outbreak of the war, on October 4, the Egyptian command publicly announced the demobilization of part of the reservists called up during September 27 to lull Israeli suspicions. Around 20,000 troops were demobilized, and subsequently some of these men were given leave to perform the Umrah (pilgrimage) to Mecca. According to Egyptian General El-Gamasy, "On the initiative of the operations staff, we reviewed the situation on the ground and developed a framework for the planned offensive operation. We studied the technical characteristics of the Suez Canal, the ebb and the flow of the tides, the speed of the currents and their direction, hours of darkness and of moonlight, weather conditions, and related conditions in the Mediterranean and Red sea." He explained further by saying: "Saturday 6 October 1973 (10 Ramadan 1393) was the day chosen for the September–October option. Conditions