 When Farouk asked Serry to read out a list of who was involved in the conspiracy, he laughingly dismissed them as too junior to pose a threat, appointed his brother-in-law Ismail Chirine War Minister with orders to "clean up" the Army and returned to the Montaza Palace, unworried.The appointment of Chirine as War Minister spurred the Free Officers into action, and on 22 July their leaders, General Muhammad Naguib and Colonel Gamal Abdel Nasser, decided on a coup the next day.Learning from one of his spies that the coup was due to begin tomorrow, at about 7 pm, Farouk ordered the arrest of all the Free Officers.