This book describes in detail the fighting in all naval theaters during the First World War of 1914-1918. The main attention is paid to the confrontation between the fleets of Germany and Great Britain in the North Sea, as well as the actions of German submarines and anti-submarine warfare of the allied fleets. The book contains 67 maps and more than 250 rare illustrations. It is addressed to a wide range of readers interested in the political and military history of the 20th century.