Pre-war papers and correspondence, 1898-1914, including lectures, texts and notes written whilst Commandant of the Staff College, Camberley, Surrey. Papers relating to his service as Quartermaster General to the BEF (British Expeditionary Force), Western Front, 1914-1915, including correspondence with Maj Gen Sir Stanley Brenton von Donop, Master General of the Ordnance, and Maj Gen Sir John Steven Cowans, Quartermaster General to the Forces, relating to supplies of equipment, provisions and munitions. Papers and correspondence, 1915, as Chief of General Staff, BEF (British Expeditionary Force), Western Front, principally comprising reports and memoranda prepared for the War Office and the War Council by General Headquarters Staff, 1915; memoranda relating to general military strategy, 1915, notably in the Balkans, Dardanelles, Gallipoli and Egypt; papers in French concerning the Allied Conference at Chantilly, 1915. Papers relating to service as Chief of the Imperial General Staff during World War One, 1915- 1918, principally comprising Army Council and War Cabinet papers relating to manpower, 1915-1918; papers of FM Horatio Herbert Kitchener, 1st Earl Kitchener of Khartoum and Broome, Secretary of State for War, given to Robertson following Kitchener's death in Jun 1916; personal telegrams, 1916- 1917, mainly comprising unofficial messages to and from various army commanders and military attachés in Salonika, Russia, Egypt, Mesopotamia, Italy, Romania, Palestine and the Western Front; memoranda and papers on military operations in the Middle East, 1915-1917, and general strategy, 1917-1918, prepared by Robertson for the War Cabinet; documents relating to the creation of the Allied Supreme War Council, and its various powers and functions, 1917-1918. Papers created as Commander in Chief, Eastern Command and Home Forces, 1918-1919, consisting of inspection reports of various depots and units in the UK, and general correspondence. Papers created as General Officer Commanding in Chief, BAOR (British Army of the Rhine), 1919-1920, including printed memoranda by French Marshal Ferdinand Foch, Allied Supreme Commander on the Western and Italian Fronts, on the conditions required to ensure peace in Europe, 1918-1919; papers relating to the organisation and functions of the British Zone of Occupation in Germany, 1919; correspondence with Gen Sir Henry Hughes Wilson, Chief of the Imperial General Staff, the Rt Hon Winston (Leonard Spencer) Churchill, Secretary of State for War, and Maj Gen Sir Charles 'Tim' Harington Harington, Deputy Chief of the Imperial General Staff, 1919; inspection reports of BAOR (British Army of the Rhine) units, 1919. Private correspondence, mainly relating to Robertson's work during World War One, including correspondence with Lt Col Arthur John Bigge, 1st Baron Stamfordham, Private Secretary to HM King George V, 1914-1918; Maj Gen Charles Edward Callwell, Director of Military Operations at the War Office, 1915; Gen Sir Archibald (James) Murray, Chief of the Imperial General Staff and General Officer Commanding in Chief, Egyptian Expeditionary Force, 1915-1916; the Rt Hon David Lloyd George, Secretary of State for War, 1916, and Prime Minister, 1916-1918; FM Sir Douglas Haig, Commander in Chief, British Armies in France, 1915-1918; Maj Gen Frederick (Barton) Maurice, Director of Military Operations at the War Office, 1917-1918; and the Rt Hon Winston (Leonard Spencer) Churchill, Secretary of State for War, 1919-1920. Also including correspondence, memoranda and notes concerning the events leading up to the resignation of Robertson as Chief of the Imperial General Staff in Feb 1918, dated Jan-Feb 1918. Semi-official papers and private correspondence, 1915-1918, collected by Brig Gen Cecil Courtenay Lucas, Robertson's Aide de Camp, mainly comprising correspondence between Robertson and Gen Sir Archibald (James) Murray, Gen Sir Beauchamp Duff, Gen Sir Charles Carmichael Monro, and Gen Sir Edward Henry Hynman Allenby, relating to military operations in India, Mesopotamia, Egypt and Palestine, 1916-1918; Lt Col Sir Maurice Pascal Alers Hankey, Secretary to the War Cabinet and the Committee of Imperial Defence, 1916-1917; Lt Gen the Rt Hon Jan Christian Smuts, South African Representative on the British War Cabinet, 1917; Gen Sir (Francis) Reginald Wingate, Governor General of the Sudan, 1916, and High Commissioner of Egypt, 1917; and Lt Col Charles A'Court Repington, Military Correspondent of The Times, 1916-1917. General correspondence with various on military matters, 1916-1918, including Reginald Baliol Brett, 2nd Viscount Esher, Lt Gen George Francis Milne, French Gen Robert Georges Nivelle, Italian Gen Luigi Cadorna, Lt Gen Sir Frederick Stanley Maude, and Gen Sir Herbert Charles Onslow Plumer.

Papers relating to Gallipoli (Faber and Faber, London, 1936), 1927-1967, principally comprising original typescript, [1936]; correspondence, 1927-1967, notably with Brig Gen Cecil Faber Aspinall-Oglander, 1933-1939, Gen Sir Ian (Standish Monteith) Hamilton, 1934-1941, Capt Sir Basil Henry Liddell Hart, 1936-1937, AF Sir Roger John Brownlow Keyes, Bt, 1934-1939, and Maj Gen Arthur Cecil Temperley, 1935-1939; newspaper cuttings, [1915]-1966, including reviews of Gallipoli, 1936-1937, and cuttings relating to the Gallipoli campaign, [1915]-1966; 'Gallipoli', [script of radio programme] by Val Henry Gielgud, 1936; photographs of Gallipoli taken by North, [1936]. Papers relating to North West Europe (HMSO, London, 1953), 1943-1961, including original typescript, [1953]; correspondence, 1944-1957, notably with Liddell Hart, 1953-1954, and FM Bernard Law Montgomery, 1st Viscount Montgomery of Alamein, 1954-1955; press cuttings, 1943-1961, comprising reviews of North West Europe, 1944-1945, dated 1953-1954, and cuttings relating to World War Two, dated 1943-1961; official US Government and HMSO publications relating to World War Two, 1945-1946. Papers relating to The Alexander memoirs (Cassell, London, 1962), dated 1941, 1945, 1946, 1948, 1959-1964, including draft copy, [1962], and published copy, 1962; correspondence, 1961-1964, notably with FM Harold Rupert Leofric George Alexander, 1st Earl Alexander of Tunis, 1961-1963, Liddell Hart, 1961-1962, and Montgomery, 1962; newspaper cuttings, 1945-1946, 1948, 1959-1963; photographs taken by North and Alexander on a visit to the Middle East and Italy, 1960. Other papers, [1931-1968], including articles by North, [1939-1966], notably concerning training, tactics and weaponry; correspondence, [1933-1960]; maps of UK and North West Europe, 1931-1944; press cuttings, 1939-1966, including reviews of Men Fighting (Faber and Faber, London, 1958), 1958-1959; 'Diary of the Belgian Campaign, May 1940', typescript text by AF Sir Roger John Brownlow Keyes, dated [1940].

Typescript of Letters from Helles (Longmans, London, 1936) describing his service in Egypt and Gallipoli, 1914-1915, written in [1930-1936]. Army books containing notes, orders and letters relating to his service at Gallipoli, Jul 1915-Nov 1915. Battalion orders for 2 Bn, Northamptonshire Regt, Alexandria, Aug-Sep 1914, and 5 Bn, Manchester Regt, Egypt, Oct 1914-Apr 1915. Papers relating to training of 5 Bn, Manchester Regt, Egypt, 1914-1915.

Typescript draft of 'The memoirs of a professional soldier in peace and war', an unpublished account of Clarke's career in the army, including service in Gallipoli and Palestine during World War One, 1968; various papers and pamphlets collated by Clarke, mainly relating to the training and performance of the Royal West African Frontier Force, 1923-[1960]; articles written by Clarke and published in British and African journals and periodicals, 1926-1959; printer's transparencies of maps used by Clarke in Part Two of the History of the Royal West African Frontier Force (Gale and Polden, Aldershot, 1964).