Battle of Naseby, was a decisive engagement of the English Civil War, fought on 14 June 1645 between the main Royalist army of King Charles I and the Parliamentarian New Model Army, commanded by Sir Thomas Fairfax and Oliver Cromwell. It was fought near the village of Naseby in Northamptonshire. After a disappointing performance by the Parliamentarian army at the Second Battle of Newbury at the tail end of the 1644 campaign season that failed to inflict a decisive defeat on the Royalists, Oliver Cromwell worked to push the Self-denying Ordinance through Parliament, intent on re-forming Parliament's forces into a more effective, centralised force. This political campaign was successful, forming the New Model Army.