14 June 1645. The decisive battle of the First English Civil War, fought in Northamptonshire. The New Model Army under Sir Thomas Fairfax and Oliver Cromwell destroyed Charles I's main field army. The King's cause was effectively finished as a military force, though fighting continued until 1646. For the Isle of Man, Naseby confirmed what Marston Moor had begun. The Royalist cause was lost, and the Stanley lordship's attachment to it would eventually bring the war to the Island itself.