In 1917 there was no sign that the world war would end in the way that each group of combatants desired, in a smashing victory for the one and a smashing defeat for the other. This volume deals with the naval and aerial activities of the contending forces, observing that 1917 was the year in which the convoy system for safeguarding Allied shipping against German attack was in full operation. Black and white photographic illustrations. Volume 4 only. Red cloth-covered boards with black text and illustration to front and gilt and black text to spine. Various scuffs, marks and discolouration. Signs of water damage to front board. Wear to edges and to top and bottom of spine. Endpapers discoloured. Textblock is lightly but evenly tanned.