Cromwell (1970) - Richard Harris, Alec Guinness

In 1640s England, King Charles I is engaged in a power struggle with Parliament, and civil war seems imminent to House of Commons member Oliver Cromwell, who's preparing to depart for the American colonies. When he's asked to stay and fight for the Parliamentary cause, however, Cromwell agrees and proves himself a natural leader of the Roundhead army. Soon, it's up to him to lead his army to victory over the king's Cavaliers and take back England for the people.