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Born in 1861; educated at King's College School, London and Royal Military Academy, Woolwich; entered Royal Engineers, 1881; Capt, 1890; Major, 1899; Instructor, Royal Military Academy, 1890-1896; Staff College, 1896-1897; Deputy Assistant Adjutant General, Intelligence Division, War Office, 1899-1901; publication of Handbook of the German Army (HMSO, London, 1900); served in South Africa, 1901-1902; Deputy Assistant Quartermaster General, Intelligence Division, War Office,1904-1908; publication of A history of the Civil War in the United States, 1861-1865 (with Henry Spencer Wilkinson) (Methuen and Co, London, 1905); Lt Col, 1906; Secretary to British Delegation to Geneva Conference, 1906; British Delegate to Red Cross Conference, 1907; Col, 1909; General Staff Officer Grade 1, War Office, 1909-1910; General Staff Officer Grade 1, 4 Div, 1911-1914; publication of Land warfare: an exposition of the laws and usages of war on land for the guidance of officers of His Majesty's Army (with Lassa Francis Lawrence Oppenheim (War Office publication, 1912); served at General HQ, BEF, 1914-1918; Deputy Engineer-in-Chief, BEF, 1918; Officer in charge of Military Branch, Historical Section, Committee of Imperial Defence, 1919-1949; publication of Military operations: France and Belgium (13 volumes) (HMSO, London, 1922-1948) and Military operations: Italy (with Henry Rudolph Davies) (HMSO, London, 1949), parts of the official history of World War One; publication of A short history of World War One (Oxford University Press, London, 1951); died in 1956.