The French battleships of the Dunkerque and Richelieu classes were the most radical and influential battleship designs of the interwar period, and were coveted by the British, German and Italian navies following the Armistice of June 1940. Using a wealth of primary-source material, some of which has only recently been made available, the authors provide a full account of their development and a detailed analysis of their design characteristics. The technical chapters are interspersed with operational histories, with a particular focus on the operations in which the ships engaged other heavy units. The book is extensively illustrated with hundreds of photographs and technical drawings, including twenty-two color profile and plan views of the ships.