<P> 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 -- 1646 ) and second ( 1648 -- 1649 ) wars pitted the supporters of King Charles I against the supporters of the Long Parliament , while the third ( 1649 -- 1651 ) 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 . </P>
who was fighting in the civil war in england and about what
Parliamentarians ( `` Roundheads '' ) and Royalists ( `` Cavaliers '' ) the manner of England 's government