In British history, the struggle in the middle years of the 17th century between the king and the Royalists (Cavaliers) on one side, and the Parliamentarians (also called Roundheads) on the other. The Parliamentarians under Cromwell dealt a series of defeats to Charles, executing him 1649, and Cromwell made himself Protector (ruler) until the Restoration of the monarchy 1660. chronology 1642 On 22 Aug Charles I raised his standard at Nottingham. The Battle of Edgehill on 23 Oct was indecisive. 1644 The Battle of Marston Moor on 2 July was a victory for the Parliamentarians under Cromwell. 1645 The Battle of Naseby on 14 June was a decisive victory for Cromwell. 1646 On 5 May 1646 Charles surrendered to the Scottish army. 1648 A Royalist and Presbyterian rising from Mar to Aug was soon crushed by Cromwell and his New Model Army. 1649 Charles was beheaded on 30 Jan.