German submarines turned the First World War into the firs commercial war on shipping, according to this, the official British history of the German campaign against merchant vessels and the responding development of the convoy system by the British navy. This edition retains the 10 maps and 31 photographs contained in the first edition, published in 1931 (Constable & Co. Ltd.). Annotation ©2004 Book News, Inc., Portland, OR (booknews.com)