in early January. On 21 May 1648, Kent rose in revolt in the King's name, and a few days later a most serious blow to the Independents was struck by the defection of the Navy, from command of which they had removed Vice-Admiral William Batten, as being a Presbyterian. Though a former Lord High Admiral, the Earl of Warwick, also a Presbyterian, was brought back to the service, it was not long before the Navy made a purely Royalist declaration and placed itself under the command of the Prince of Wales. But Fairfax had a clearer view and a clearer purpose than the distracted Parliament. He moved quickly into Kent, and on the evening of 1 June, stormed Maidstone by open force, after which the local levies dispersed to their homes, and the more determined Royalists, after a futile attempt to induce the City of London to declare for them, fled into Essex. The Downs Before leaving for Essex, Fairfax delegated command of the Parliamentarian forces to Colonel Nathaniel Rich to deal with the remnants of the Kentish revolt in the east of the county, where the naval vessels in the Downs had gone over to the Royalists and Royalist forces had taken control of the three previously Parliamentarian "castles of the Downs" (Walmer, Deal, and Sandown) and were trying to take control of Dover Castle. Rich arrived at Dover on 5 June 1648 and prevented the attempt, before moving to the Downs. He took almost a month to retake Walmer (15 June to 12 July), before moving on to Deal and Sandown castles. Even then, due to the small size of Rich's force, he was unable to surround both Sandown and Deal at once and the two garrisons were able to send help to each other. At Deal he was also under bombardment from the Royalist warships, which had arrived on 15 July but been prevented from landing reinforcements. On the 16th, thirty Flemish ships arrived with about 1500 mercenaries and – though the ships soon left when the Royalists ran out of money to pay them – this incited sufficient Kentish fear of foreign invasion to allow Sir Michael Livesey to raise a large enough force to come to Colonel Rich's aid. On 28 July, the Royalist warships returned and, after three weeks of failed attempts to land a relief force at Deal, on the night of 13