STEVE DUNN has a special interest in the Royal Navy of the late Victorian, Edwardian, and World War I eras. His books include biographies of Admirals Cradock and Troubridge and the story of the first British battleship, Formidable, to be sunk by a torpedo. His most recent books, Blockade, and Securing the Narrow Sea, cover those other significant naval theatres in the great trade battles of World War I.