The author wishes to point out that in a volume, such as this, which deals largely with modern war strategy, not a little of the information which has been placed at his disposal by official sources is not, at this time, available for publication. For this reason, the tactics herein presented deal mainly with the larger issues, but it is believed that a sufficient description of the principles has been given to make clear the chief wonders of modern land war. For the same reason, the author has not entered upon controversy with regard to the origin or the character of the Great War, but has stated only such facts as are admitted both by the Allies and by the Central Powers. Military reasons preclude the naming of those officers and officials who have been especially courteous in giving information and advice, but it may justly be said that counsel and assistance has been received from American, French, Belgian, and English sources.

Acknowledgment is made herein of the courtesy of L'Illustration, J'ai Vu, Le Monde IllustrÉ, Panorama de la Guerre, La Grande Guerre, and Le Miroir of Paris; of Illustrated London News, Graphic, Sketch, Sphere, The War of the Nations, and The War Illustrated of London; for the use of illustrations taken from their publications and being from photographs or sketches made by their photographers or artists in the field. For the use of official photographs taken by the Photographic Corps of the armies of France, Belgium, and England, acknowledgment of courtesy also is made.