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 Edgehill to Northampton, where he mustered almost 20,000 men. Learning of the King's move westwards, Essex then marched north-westwards towards Worcester. On 23 September, in the first clash between the main Royalist and Parliamentarian armies, Royalist cavalry under Prince Rupert of the Rhine routed the cavalry of Essex's vanguard at the Battle of Powick Bridge. Nevertheless, lacking infantry, the Royalists abandoned Worcester. By early October, the King's army was almost complete at Shrewsbury. He held a council of war, at which two courses of action were considered. The first was to attack Essex's army at Worcester, which had the drawback that