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
Battle of Naseby remnants of the Royalist infantry, and Rupert could not induce his men to make another charge. Fairfax halted and reorganised his lines, and when he resumed his advance, Rupert's cavalry rode off the field. Fairfax's forces pursued Royalist survivors fleeing north towards Leicester. Archaeological evidence suggests that fugitives and Royalist baggage guards tried to rally on the slopes of Castle Yard (also known as Wadborough Hill), a wooded eminence which once had a motte and bailey castle, about behind the Royalist position at the start of the battle. Many Royalists were slaughtered when they mistakenly followed what they thought was