The First English Civil War broke out in 1642. During its early campaigns, Kenilworth formed a useful counterbalance to the Parliamentary stronghold of Warwick.[112] Kenilworth was used by Charles on his advance to Edgehill in October 1642 as a base for raids on Parliamentary strongholds in the Midlands.[112] After the battle, however, the royalist garrison was withdrawn on the approach of Lord Brooke, and the castle was then garrisoned by Parliamentary forces.[113] In April 1643 the new governor of the castle, Hastings Ingram, was arrested as a suspected Royalist double agent.[114] By January 1645 the Parliamentary forces in Coventry had strengthened their hold on the castle, and attempts by Royalist forces to dislodge them from Warwickshire failed.[115] Security concerns continued after the end of the First Civil War in 1646, and in 1649 Parliament ordered the slighting of Kenilworth. One wall of the great tower, various parts of the outer bailey and the battlements were destroyed, but not before the building was surveyed by the antiquarian William Dugdale, who published his results in 1656.[5]