HMS Marlborough - A quiet afternoon at sea. HMS Marlborough was an Iron Duke-class battleship of the British Royal Navy, named in honour of John Churchill, 1st Duke of Marlborough. Built at Devonport Royal Dockyard between January 1912 and June 1914 and entered service just prior to First World War. Assigned to the Mediterranean Fleet after the war, Marlborough took part in the Allied intervention in the Russian Civil War (in the Black Sea 1919?20). She was also involved in the Greco-Turkish War.