Oliver Cromwell with Sir Thomas Fairfax in command and Cromwell as Lieutenant-General of cavalry and second-in-command. At the critical Battle of Naseby in June 1645, the New Model Army smashed the King's major army. Cromwell led his wing with great success at Naseby, again routing the Royalist cavalry. At the Battle of Langport on 10 July, Cromwell participated in the defeat of the last sizeable Royalist field army. Naseby and Langport effectively ended the King's hopes of victory, and the subsequent Parliamentarian campaigns involved taking the remaining fortified Royalist positions in the west of England. In October 1645, Cromwell besieged and took
Commander-in-Chief of the Forces this title. In 1650, Fairfax resigned his post shortly before the Scottish campaign of the War. Oliver Cromwell, Fairfax's Lieutenant-General, succeeded him as Commander-in-chief of the Forces. Under Cromwell, the Commander-in-Chief was de facto head of state, especially after the dismissal of the Long Parliament. Cromwell held the office until 1653 when he was elected Lord Protector. On 21st February 1660, the reconstituted Long Parliament resolved "that General George Monck be constituted and appointed Captain-General and Commander in Chief, under Parliament, of all the Land-Forces of England, Scotland and Ireland". After Moncks's death, the post (which gave the holder significant