Walmer Castle against Charles' brother, King James II, the townsfolk of Deal seized Walmer Castle on behalf of William III, the Prince of Orange. By the end of the century, however, the castle was increasingly regarded as out of date from a military perspective. In the 18th century, Walmer Castle became the official residence of the Lord Warden of the Cinque Ports. The Lord Warden was originally a medieval title linked to five key ports along the coast of England; the position's prominence had faded, but it still retained important judicial and military functions. When Lionel Sackville, the Duke of Dorset, was
Thomas FitzAlan, 12th Earl of Arundel The new King Henry V restored the Earl of Arundel to a place of influence, immediately appointing him Lord Treasurer, as well as constable of Dover Castle and Warden of the Cinque Ports. On 19 March 1415 The Lord Warden was ordered to summon and array seamen for a forthcoming fleet operations: 57 ships from the Cinque Ports in 40 days were expected to assemble. No ship more than 20 tuns was permitted to leave port. All requisitioned vessels were to be taken to Southampton by 8 May. On St George's Day at Windsor Arundel was made a Knight of