A brought hostilities to an end; the Anglo-Irish Treaty was signed on 6 December. The Provisional Government was then constituted on 14 January 1922. The IRA divided between those who accepted the decision of the Dáil in ratifying the Treaty and those who did not: consequently, both civil war and re-occupation by the British became possible. In February 1922, the pro-treaty IRA became the National Army of the Irish Free State. With declining relations between the remaining units of the anti-treaty IRA and the newly recruited pro-treaty National Army, the Irish Civil War broke out on 28 June 1922. It ended in victory for the National Army when, on 24 May 1923, the anti-treaty IRA Chief of Staff, Frank Aiken ordered his volunteers to dump arms.