The following is an account of the essential facts of the Battle of Jutland, amplified from the review in the author's book, A Guide to the Military History of The World War, 1914-1918, published this year by Little, Brown & Co. This gives a greatly needed description of the events of the naval action, with the forces of both sides placed in true relation, one to the other. No previously published account had contained an adequate treatment of the manoeuvres of both fleets, as certain important events of the action were not understood, and it had been assumed that situations existed for which there was no foundation in fact. All this has resulted in a mass of confused and erroneous narratives-and the Battle of Jutland has become one of the most misunderstood actions in history.