COPYRIGHT, 1917, BY JOHN HAYS HAMMOND, JR. AND ANNA CRAFTS CODMANALL RIGHTS RESERVEDPublished November 1917CONTENTS [Foreword by the Translator]vii [Introduction by John Hays Hammond, Jr.: The Challenge to Naval Supremacy]xiI.[Ordered to command a Submarine]1II.[Breathing and Living Conditions under Water]6III.[Submersion and Torpedo Fire]17IV.[Mobilization and the Beginning of the Commercial War]39V.[Our own Part in the Commercial War and our First Captured Steamer]53VI.[The Capture of two Prize Steamers]74VII.[Off the Coast of England]97VIII.[The Method of Sinking and Raising Ships]122ILLUSTRATIONS[Passengers and Crew leaving a Sinking Liner torpedoed by a German Submarine in the Mediterranean]Frontispiece[Interior of a Submarine]xliv[A Torpedoed Schooner]36[German Submarines U 13, U 5, U 11, U 3, and U 16 in Kiel Harbor]40[Von Forstner's Submarine (U 28) in Action in the North Sea: A Series of Photographs taken from the Deck of one of her Victims] From the London Graphic, March 27, 191578[Lifeboat leaving the Sinking P. and O. Liner Arabia]98[British Hospital Ship Gloucester Castle, showing Red Cross on Bow, sunk in the English Channel by a German Submarine]126