Inspired by Gamal Abdel Nasser of Egypt, officers from the Nineteenth Brigade, 3rd Division known as "The Four Colonials", under the leadership of Brigadier Abd al-Karīm Qāsim (known as "az-Za`īm", 'the leader') and Colonel Abdul Salam Arif overthrew the Hashemite monarchy on July 14, 1958. The new government proclaimed Iraq to be a republic and rejected the idea of a union with Jordan. Iraq's activity in the Baghdad Pact ceased.