“This book is the result of the collaboration of many persons, named and unnamed. A chapter of special interest is contributed by Prof. W. L. Bragg, O.B.E., M.C., F.R.S., who, with the aid of photos and diagrams, gives a simple explanation of the ‘mysteries’ of Sound Ranging. The rank and file, who are allowed to speak for themselves, make several notable contributions, and the illustrations are from sketches made by the men in their spare time at the front. Capt. Innes who was the Adjutant of the 1st Field Survey Batt. R.E., and who received a Mention in Despatches, has woven the threads skillfully to provide a pattern that is refreshingly informal,…the book is a serious contribution to the history of the war.”—Publisher's abstract.