On 27 May 1973, the IDF announced a state of emergency and reserve troops were called up in response to a movement of Egyptian troops. The state of emergency was cancelled when it became clear that this was only an exercise. This event had a major impact on the General Staff, as it led them to believe that the Egyptian forces were not preparing for war, later that year, on Yom Kippur. After the war however, it became apparent that these frequent maneuvers carried out by the Egyptians were part of an elaborate ruse meant to induce complacency in the Israelis regarding the true intentions of Egyptian troop movements at the time the actual attack took place.