Papers created or collected by Maj Gen Sir Thompson Capper during the course of his military career, [1896-1914], dated [1888], [1896], [1900]-1902, 1905, 1907-[1914] , principally comprising papers relating to his work at Staff College, Quetta, [1908]-1911; printed pamphlets and notes on operations in Manchuria during the Russo-Japanese War, 1904-1905, dated [1908-1914]; printed pamphlet and notes relating to operations against Dervish rebels in British Somaliland in 1913, dated [1913]; papers relating to his service with 13 Infantry Bde, notably including printed training instructions, 1907 and 1909, and his circular to officers of 3 Infantry Bde summarising the official report on army manoeuvres, Dublin, 1910. Three printed books, 1888, 1902 and 1908, comprising books on Napoleon I (Napoleon Bonaparte) and the Franco-Prussian War of 1870-1871 and The Second Afghan War (John Murray, London, 1908), an official account produced in the Intelligence Branch, Army HQ, India, annotated by Capper.

The papers cover the period 1915-1978, and include papers on his service in World War One, in particular extracts from diary on Galliopoli offensive May 1915 and Allied raid on Zeebrugge, Apr 1918; correspondence, narratives of operations and photographs from service as Officer Commanding Sudan Camel Corps, 1927-1930; reports on defence of British Somaliland and accounts of Italian invasion of Somaliland from service as Officer Commanding Somaliland Camel Corps, 1937-1940; papers on service as Military Governor and Officer Commaning, British Somaliland, 1941-1943; papers on service as Officer Commanding Portsmouth Div Royal Marines, including narrative of Operation OVERLORD, 1943-1944; papers on service as Director of Combined Operations, India and South-East Asia, including notes on Operation LIGHTNING, 1944-1945; papers on service as Commander Chatham Group Royal Marines, including lecture notes1946-1948; unpublished manuscripts on aspects of Allied war effort in British Somaliland; papers on service as Honorary Colonel Somaliland Scouts, 1948-1958, and membership of Anglo-Somali-Society, 1960-1978.

Narrative of operations of 7 Division, 1918 by the Revd E C Crosse including reference to Clifford's service as Officer Commanding 95 Field Company, Royal Engineers; papers relating to Anglo-Italian Jubaland Boundary Commission, 1925-1928 including maps; British Somaliland-Ethiopia Boundary Commission, 1931-1936, including intelligence reports on French Somaliland, air survey operations, Walwal incident between Italian and Ethiopian troops, and printed reports on the work of the Commission; Chief Engineer, China Command, including report on Royal Engineers in Hong Kong, 1941-1942; Kenya-Ethiopia Boundary Commission, 1950-1957, including diaries, 1951-1955, printed reports, and maps of the boundary, 1946-1949; published articles by Clifford, 1928-1947, mainly on boundary commissions; technical manuals, 1924-1932, including surveying; publications and printed works, 1892-1952, including boundary commissions.

Papers relating to his service in Somaliland, 1940, notably including typescript copies of telegrams to Lt Gen Arthur Francis Smith, Deputy Chief of General Staff, [GHQ Middle East], giving a brief account of the attack by Italian troops on British forces at Tug Argan, 11 Aug 1940, dated 12 Aug 1940, and to [Gen Sir Archibald Percival Wavell] giving an appreciation of the current situation in Somaliland, 14 Aug 1940.

Papers relating to his life and career, 1917-1963, principally comprising official correspondence with Lt Gen M Brocas Burrows, British Military Mission, Moscow, 1944-1945, Gen Mark Wayne Clark, US Army, 1943-1944, 1951-1952, Maj Gen Richard Henry Dewing, UK Army and RAF Liaison Staff, Australia, 1943-1944, Maj Gen Gordon Edward Grimsdale, Military Attaché andhead of Military Mission to Chungking, China, 1942-1943, AF Sir Roger John Brownlow Keyes, Bt, Director of Combined Operations, War Office, 1940-1942, Lt Gen Sir Henry Pownall, South East Asia Command HQ, 1944-1945, Lt Gen Sir Harold Redman, British Joint Staff Mission, Washington DC, 1943-1944, AF Sir James Somerville, Commander-in-Chief Eastern Fleet, 1943-1947, and Maj Gen Sir Edward Spears, Minister to the Lebanon, 1940-1944, and Lt Gen Albert C Wedemeyer, US Army, Deputy Chief of Staff; South East Asia Command, 1944; personal correspondence with and about FM Lord Alanbrooke, 1946-1947, 1957-1963, FM Sir Claude John Eyre Auchinleck, 1941-1961, and FM Archibald Percival Wavell, Viscount Wavell of Cyrenaica and of Winchester, 1943-1946; official andpersonal correspondence with Dwight David Eisenhower, 1942-1965, and AF Louis (Francis Albert Victor Nicholas) Mountbatten, 1st Earl Mountbatten of Burma, 1943-1954, 1960-1964; correspondence with publishers and colleagues, including Gen Sir Richard Nugent O'Connor; papers relating to India, 1947-1951, including his correspondence as Chief of Staff to Mountbatten, 1947, notes on interviews with Jawaharlal Nehru and Mahomed Ali Jinnah, 1947, letters describing the political situation in India, 1947-1948, and correspondence concerning compensation for Indian Government servants, 1948-1951; correspondence concerning the proposed defence reorganisation, 1955-1963; papers relating to his service as Secretary General, NATO (North Atlantic Treaty Organization), 1952-1957, including his official progress reports, 1952-1956; newspaper cuttings, statements to the press and texts of speeches and broadcasts, 1952-1957; papers relating to his memoirs, [1940-1960] including correspondence with publishers, 1960-1961, and colleagues, 1957-1960, notebooks, 1940-1960, and drafts and proofs, [1960]. newspaper cuttings, 1943, 1948, 1951-1952, 1957; texts of speeches, 1943-1958; correspondence relating to operations in Somaliland, 1917-1920; notes and papers relating to his studies at Staff College, Quetta and RAF Staff College, 1922-1924. Papers relating to Rt Hon Sir Winston (Leonard Spencer) Churchill, 1940-1965, including personal correspondence with Churchill, 1940, 1943-1945, 1947-1964; correspondence relating to Churchill's memoir The Second World War (Cassell, London, 1948-1954), 1946-1956, including correspondence relating to Dieppe Raid, Aug 1942, dated 1950, and galley proofs, [1948-1954]. Printed material, 1941-1945, 1947, 1951, notably including copies of telegrams sent by Winston Churchill as Prime Minister, 1941-1942; minutes of Chiefs of Staff meetings, 1943-1944; minutes of Combined Chiefs of Staff meetings, 1943, 1945.

Papers relating to international peacekeeping and relief work, 1979-2000, chiefly by the United Nations, including: papers relating to Commonwealth ceasefire monitoring, Rhodesia [now Zimbabwe], 1979-1980; United Nations High Commissioner for Refugees Handbook for Emergencies (Geneva, Switzerland, 1982); United Nations Standing Operating Procedures (SOPS), for United Nations missions in Cyprus, 1984, Iraq-Kuwait border, 1991, Cambodia, 1992, and Liberia, 1993; account of Joint Task Force PROVIDE COMFORT for humanitarian relief in Turkey to Kurdish refugees from Iraq, 1991; reports and information bulletins on peacekeeping and relief operations, former Yugoslavia, 1993-1994. United Nations Department of Peacekeeping publications, 1995-1997, including guidelines and handbooks for peacekeeping and policing procedures, and printed maps of disaster relief and peacekeeping operations areas, including Beirut, Bosnia and Herzegovina, Cambodia, Ethiopia, Somalia, Uganda, and Zimbabwe. Also NATO peacekeeping guidelines, and United States Army and British Army Field Manuals relating to peacekeeping and general tactical doctrine 1977, 1985, 1993-1995.