The gigantic scale of the present war defies comparison with those of the past, and battles which formerly held the world in suspense are now almost forgotten. The German people have been kept informed of the progress of events on all fronts since the 4th August 1914, by the daily official reports of the German General Staff, but the general public will have been unable to gather from these a coherent and continuous story of the operations. For this reason the General Staff of the German Field Army has decided to permit the publication of a series of monographs which will give the German people a general knowledge of the course of the most important operations in this colossal struggle of nations. These monographs cannot be called histories of the war; years, even decades, must pass before all the true inwardness and connection of events will be completely revealed. This can only be done when the archives of our opponents have been opened to the world as well as our own and those of the General Staffs of our Allies. In the meantime the German people will be given descriptions of the most important of the battles, written by men who took part in them, and have had the official records at their disposal. It is possible that later research may make alterations here and there necessary, but this appears no reason for delaying publications based on official documents, indeed to do so would only serve to foster the legends and rumours which so easily take hold of the popular imagination and are so difficult, if not impossible, to correct afterwards. This series of monographs is not therefore intended as an addition to military science, but has been written for all classes of the German public who have borne the burden of the war, and especially for those who have fought in the operations, in order to increase their knowledge of the great events for the success of which they have so gladly offered their lives. GENERAL STAFF OF THE FIELD ARMY. GERMAN GREAT HEADQUARTERS, _Autumn, 1917_. PRELIMINARY REMARKS