Correspondents include: Lieutenant-Colonel Charles Hordern, WSC's researcher, on various subjects including the correction of proofs (23); Brigadier General James Edmonds of the Military Branch of the Historical Section (2) on various subjects including a request that his name should not appear in connection with the book; Sir Maurice Hankey [Secretary to the Committee of Imperial Defence] (4) on suggested corrections to proofs; Butler and Tanner Limited on the preparation of proofs of the book, provisionally entitled "The Unknown War" (12); [Major] Desmond Morton on Soviet exports (2); Thomas Holland on German importation of raw materials for the manufacture of munitions prior to World War I; Charles Scribner on an American edition of the book (6); Sir Robert Vansittart on source material; H J Bourne of Thornton Butterworth Limited on the serialisation of the book in the Morning Post; Lints Smith of the Times declining to an invitation to serialise the book; Sir Alfred Knox and Walter Elliot on proof-reading; and Major-General Sir Charles Maynard.Also includes notes and material on Russian losses in East Prussia [later part of Poland] and losses of British battleships in World War I and a draft of the preface.