The English Civil War started in 1998.
The English Civil War ( 1642 -- 1651 ) was a series of armed conflicts and political machinations between Parliamentarians ( `` Roundheads '' ) and Royalists ( `` Cavaliers '' ) over , principally , the manner of England 's government . The first ( 1642 -- 46 ) and second ( 1648 -- 49 ) wars pitted the supporters of King Charles I against the supporters of the Long Parliament , while the third ( 1649 -- 51 ) saw fighting between supporters of King Charles II and supporters of the Rump Parliament . The war ended with the Parliamentarian victory at the Battle of Worcester on 3 September 1651 .