Papers of Major General Sir Frederick Barton Maurice, relating to his letter to the press concerning the government's statements about the strength of the British Army, May 1918, dated 1917-1971, principally comprising Maurice's diary, Jan-May 1918; printed and typescript texts by Maurice, 1918-1919, 1922, notably including 'The story of the crisis of May 1918', dated 1918; correspondence with family and colleagues, 1918-1922, 1925, 1934, 1936; newspaper cuttings, 1918, 1936, 1939; copies of Parliamentary and War Cabinet papers, 1918; correspondence relating to The Maurice Case (Leo Cooper, London, 1972) by Nancy Maurice (Nancy Spears, wife of Maj Gen Sir Edward (Louis) Spears, 1st Bt), 1967-1971. Papers collected by Maurice during the writing of The life of General Lord Rawlinson of Trent (Cassell and Co, London, 1928) and Haldane (Faber and Faber, London, 1937, 1939), comprising letters received by Rt Hon Richard Burdon Haldane, 1st Viscount Haldane, 1894, 1898, 1902, 1915-1916, 1919, 1928; letters received by Henry Seymour Rawlinson, 1st Baron Rawlinson of Trent, 1888, 1914-1916, 1918, 1921, notably including letters from Maj Gen Henry Hughes Wilson and Gen Sir Alexander John Godley concerning the Battle of the Aisne, Sep 1914 and operations at Gallipoli, 1915.

Other papers relating to his life and career, 1888-1951, dated 1888-1971, principally comprising letters to his wife describing his service in South Africa, 1899-1900, and as General Staff Officer, 3 Div, France, 1914-1915, and Director of Military Operations, Imperial General Staff, 1915; correspondence, 1915-1919, relating to his service as Director of Military Operations, 1915-1918, notably including letters from Maj Gen Archibald Armar Montgomery-Massingberd, Maj Gen John Humphrey Davidson, Lt Gen Sir George (Norton) Cory, Lt Gen Sir William Raine Marshall, Maj Gen Sir Arthur Lynden Lynden-Bell concerning operations on the Western Front, 1916-1917, and in the Balkans, 1916-1917, Mesopotamia, 1917-1918, and Palestine, 1917; correspondence with Gen Sir Charles Harington Harington, [1923], 1925, 1932, 1934; printed and typescript articles, lectures and other writings, 1913-1943, notably including text of 'On the uses of the study of war', his inaugural lecture as Professor of Military Studies, London University, 1927, text of Maurice's Lee Knowles lecture 'Public opinion in war', and articles on arms limitation, 1921, 1926, the Graeco-Turkish War, 1922, the Corfu Incident, [1923], and the possibility of war between the USA and Japan, 1925; newspaper cuttings, 1912-1919, 1924-1927, 1938, 1945, 1951, principally comprising reviews of his books. Family papers, [1806-1812], principally comprising papers relating to Maurice's grandfather, Frederick Denison Maurice, [1833-1869], 1927; papers relating to his wife's family, [1806-1812], 1874-1879, 1896, 1909-[1915], 1921, notably including personal letters written by her great-grandfather, Spencer Perceval, [1806-1812], and an account of a day during the Paris Commune, written in [1871] by [Norman Spencer].

Copy of detailed memoir, 'From air to chair', covering his RAF career, 1929-1961, including sections on his RAF training, bomber squadron service, 1930-1933, armament training and duties, 1933-1944 and service in Iraq, 1937-1939, Bomber Command, 1939-1940, the Air Ministry, 1940, 1947-1949 and 1954-1956, Malaya, 1946, Joint Services Staff College, 1947, Central Gunnery School, 1949-1951, Rhodesian Air Training Group, 1951-1953 and Technical Training Command, 1956-1961, written in 1985. Copy of chapter of personal family history giving an account of his father, Lt Col Lewis Collinwood Bearne, during the period 1878-1918, including his service in the Boer War and World War One, [1980-1985].