The English Civil War took place between 1642 and 1651. It was a series of armed conflicts and political machinations between Parliamentarians ("Roundheads", led by Oliver Cromwell) and Royalists ("Cavaliers", led by Charles I) over, principally, political power and authority. There were three main phases to the war: The first (1642–1646) and second (1648–1649) wars pitted the supporters of Charles I against the supporters of the Long Parliament, while the third (1649–1651) saw fighting between supporters of Charles's son—Charles II—and supporters of the Rump Parliament. The war ended with the Parliamentarian victory at the Battle of Worcester on 3 September 1651.