This is a timeline of the Irish Civil War, which took place between June 1922 and May 1923. It followed the Irish War of Independence (1919–1921), and accompanied the establishment of the Irish Free State as an entity independent from the United Kingdom of Great Britain and Ireland. The conflict was waged between two opposing groups of Irish nationalists: the forces of the new Irish Free State, who supported the Anglo-Irish Treaty under which the state was established, and the republican opposition, for whom the Treaty represented a betrayal of the Irish Republic.