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 By the end of the century, however, the castle was increasingly regarded as out of date from a military perspective.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 duplicate of the newly converted 75th (Home Counties) (Cinque Ports) Anti-Aircraft Regiment, based on two batteries (234th and 235th) transferred from that regiment, together with a more experienced anti-aircraft (AA) battery (205th), which had served with several Kent units, most recently 55th (Kent) AA Rgt, and provided the regimental headquarters (RHQ) at Sittingbourne. Whether officially sanctioned or not, the new regiment used the same 'Cinque Ports' subtitle as its parent regiment raised in the ancient Cinque Ports of Kent. The new regiment came into existence in April 1939 with the following organisation: 89th (Cinque Ports) Anti-Aircraft Regiment, Royal Artillery The