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 By the end of the century, however, the castle was increasingly regarded as out of date from a military perspective.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
89th (Cinque Ports) Heavy Anti-Aircraft Regiment, Royal Artillery Counties) AA Bde) based at Dover, part of 1 AA Group. In 1953, the regiment was officially given the subsidiary title 'Cinque Ports' after its parent 75th (Home Counties) (Cinque Ports) HAA Rgt raised in the ancient Cinque Ports of Kent. Anti-Aircraft Command was disbanded on 1 March 1955 and 489 (Cinque Ports) HAA Rgt was disbanded at the same time. Winston Churchill, Lord Warden of the Cinque Ports, was appointed Honorary Colonel of 89th (Cinque Ports) HAA Rgt on 20 February 1942. 89th (Cinque Ports) Heavy Anti-Aircraft Regiment, Royal Artillery The 89th (Cinque Ports) Heavy Anti-Aircraft Regiment, Royal Artillery