The siege was lifted on 23 August 1642 when the garrison was relieved by the forces of the Earl of Essex, and the Royalists were forced to retreat to Worcester. After the Battle of Edgehill in 1642 – the first pitched battle of the English Civil War – prisoners were held in Caesar's and Guy's Towers. During the Second English Civil War prisoners were again held at the castle, including those from the Battle of Worcester in 1651. A garrison was maintained in the castle complete with artillery and supplies from 1643 to 1660, at its strongest it numbered 302 soldiers. In 1660 the English Council of State ordered the castle governor to disband the garrison and hand over the castle to Robert Greville, 4th Baron Brooke. The state apartments were found to be outmoded and in poor repair. Under Roger and William Hurlbutt, master carpenters of Warwick, extensive modernization of the interiors was undertaken, 1669–78. To ensure that they would be in the latest taste, William was sent to Dorset to make careful notes of the interiors recently finished at Kingston Lacy for Sir Ralph Bankes to designs by Sir Roger Pratt. On 4 November 1695 the castle was in sufficient state to host a visit by King William III.