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Oliver Cromwell led the parliamentary forces and organised the New Model Army

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Who fought against whom in the English Civil War?

England against Scotland

The king (Royalists) against Parliament (Parliamentarians)

Catholics against Protestants

England against France

Explanation

The English Civil War was fought between the Royalists (Cavaliers) who supported King Charles I and the Parliamentarians (Roundheads). While religion played a role, it was fundamentally a conflict over the power of the king versus Parliament, not a war against another country.