Charles, having completed his preparations, marched by Wolverhampton, Birmingham, towards Banbury, thus getting between Essex and London. Turning round, he defeated Essex at the Battle of Edgehill, and slowly marched on towards London, before turning after the Battle of Brentford retreating first to Reading and then to Oxford. The result of the advance by the Royalists towards London was that the Parliament troops evacuated Worcestershire.  1643. The King established his headquarters at Oxford, and was most anxious to win the highlands of the Cotswolds and the line of the river Severn. The Parliamentarians had two armies. Their plan was that the two armies, one of which was engaged before Reading under Essex, the other under William Waller had its headquarters at Bristol, should unite and take Oxford. Essex took Reading. Waller, operating from Gloucester, cleared the county, and by taking Hereford cut off communication with Wales. To make all safe in the Severn Valley, Charles besieged Gloucester, but Essex was able to raise the siege.  1644. Again Parliamentary forces tried the same plan as the previous year. Essex and Waller were to join and march on Oxford. They did so, and very nearly caught Charles I, but he escaped, marched by Broadway to Evesham, Pershore to Worcester, and on to Bewdley. Waller followed him, but the two armies did not come to close quarters; the only fighting was Wilmot's attempt to relieve Dudley Castle, which was being besieged by Lord Denbigh. Charles retired towards Oxford, followed by Waller, who was defeated by Wilmot at the Battle of Cropredy Bridge. Charles then returned into Worcestershire, and stayed at Evesham for some days.  1645. Edward Massey, the Governor of Gloucester, stormed and took Evesham, thus severing the Royalist line of march from Worcester to Oxford. Charles marched to Inkberrow, Droitwich, Bromsgrove, and on to Leicester and then to Naseby, where he was defeated; then back by Kidderminster, Bewdley to Hereford and South Wales. The Scottish army came to the help of the English, and marched to Alcester on their way to attack Worcester, but turned off to Droitwich, Bewdley, and so to Hereford, which they besieged. Charles marched north, and working round reached Oxford. Having got some troops together, he marched to the relief of Hereford.