John Boys (Royalist) Boys himself went to London rather than continue further military resistance while others of the Regiment went on to serve at Wallingford Castle. During August 1648, he made a futile attempt to raise the Siege of Walmer Castle in Deal, one of the Cinque Ports, and customary home of the Lord Warden. Sir Algernon Sydney replaced him as Warden in 1648. In 1659, Boys was held as a prisoner in Dover Castle for "petitioning for a free Parliament", but was released on 23 February 1660. He was then, reputedly, granted the office of Receiver of Customs at Dover from Charles
Cinque Ports Fortress Royal Engineers and signal companies of the Home Counties Division and a group of 'Kent and Sussex Fortress Companies'. These became the Sussex Fortress Royal Engineers based at Seaford, East Sussex, the Kent Fortress Royal Engineers based at Gillingham, and a company at Dover entitled the Cinque Ports Fortress Royal Engineers by 1910. At the outbreak of World War I the unit consisted of a single Electric Lights Company based at 16 Bench Street, Dover, forming part of South East Coastal Defences. With the expansion of the army the Cinque Ports company contributed personnel to the 1/6th and 1/7th Kent Fortress Companies