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 Inverkeithing under David Leslie. After his victory at the Battle of Dunbar, Oliver Cromwell went on to occupy large parts of southern Scotland. David Leslie, commanding the royalist forces, in recovering from the disaster at Dunbar, created a series of defensive redoubts in the centre of the country, effectively preventing the New Model Army from making any further progress in the campaign. Unable to push past Leslie, firmly entrenched at Stirling, Cromwell was quick to realise that Fife, on the northern shore of the Firth of Forth, was now the key of the whole campaign. Once across the Forth the English