Papers relating to operations in the Western Desert, 1940-1941, especially Battles of Sidi Saleh, Beda Fomm and Operation BATTLEAXE, the attempt to relieve Tobruk, including typescript report by Lt Gen Sir Richard Nugent O'Connor on operations of 7 Armoured Div, Mechili, Cyrenaica, Libya, Feb 1941; typescript text of lecture by Creagh entitled 'Operations of the 7th Armoured Division in the Western Desert from June 1940 to March 1941' [1942]; typescript reports by unit commanders and Staff Officers on operations during First Libyan campaign, 1940-1941, including Lt Gen Sir Noel Monson de la Poer Beresford-Pierse, General Officer Commanding Western Desert Force, Lt Gen Sir Richard Nugent O'Connor, General Officer Commanding 13 Corps, Brig John Alan Lyde Caunter, commanding 4 Armoured Bde, Col George Edward Younghusband, 2 Armoured Div, Brig William Henry Ewart Gott, commanding Support Group, and Brig Hugh Edward Russell, commanding 7 Armoured Bde; typescript report by Creagh entitled 'The 7th Armoured Division', with five printed maps of North Africa, Nov 1943. Correspondence, 1942-1970, notably including letters from Lt Gen Giffard Le Quesne Martel, Commander Royal Armoured Corps, 1942, and Lt Gen Sir Richard (Alan) Fyffe, Col Commandant, 3 Bn, The Royal Green Jackets, 1970.

Manuscript extracts from Regimental diary, Second Boer War, South Africa, 23 Dec 1900-4 Mar 1901; six letters relating to operations against Boer forces in the Transvaal, South Africa, 1899-1901, with manuscript sketch map of a Boer night attack, Lake Chrissie (Chrissiesmeer), 6 Feb 1901, approximate scale 1: 10, 660. Photograph album with 106 photographs, mostly relating to service in South Africa, 1900-1904, Ireland, 1904-1905, and the UK, 1906-1907; photograph album with 485 photographs relating to service in Scutari, Albania, 1913, with German map entitled Scutari (Militärgeographisches Institut, Berlin, Germany, 1912), scale 1: 200, 000, and typescript copy of article from the Yorkshire Post entitled 'The West Yorkshires in Scutari. Incidents of International Control', 28 Aug 1913; photograph album with 283 photographs, mostly relating to service in India, Aden, Egypt and the Sudan, 1925-1928.

Papers relating to his life and career, 1885-1941, including typescript volume entitled 'The story of the Egyptian campaign, 1885-1886', written in [1914]; two typescript volumes entitled 'My narrative of the South African War 1899-1902' and 'Second phase of the South African War' with sketch maps, notes and recommendations of awards for officers and men of 2 Mounted Infantry Corps, 1899-1900; reports, notes and correspondence, 1900-1912, relating to the future development of cavalry in the British Army, including typescript extracts from article by Maj Gen Sir Ian Monteith Hamilton on operations at Diamond Hill, Second Boer War, South Africa, Jun 1900, and correspondence with FM Rt Hon Frederick Sleigh Roberts, 1st Earl Roberts of Kandahar, Pretoria and Waterford, Lt Gen Sir Horace Lockwood Smith-Dorrien, Maj Gen Edmund Henry Hyman Allenby, Maj Gen Sir Edward Thomas Henry Hutton, and Lt Col Hubert De la Poer Gough, 1903-1910; typescript notes on cavalry tactics, equipment and history, entitled 'Letters from an old cavalry officer to his son', 1909; two typescript volumes entitled 'My narrative of the Great German War', an account of his service in World War One in Gallipoli and on the Western Front, 1914-1918, including 29 photographs and typescript table showing number of 29 Div casualties between 1915 and 1917; manuscript article by De Lisle entitled 'General Sir Archibald Wavell GCB: the unknown leader', 1941; typescript unpublished novel entitled 'The great recovery', 1941, based on De Lisle's experiences in World War One, 1914-1918.

Map of area around the Black Sea, Caspian Sea and Eastern Mediterranean, including Turkey and parts of the USSR, North Africa and the Middle East, drawn up by the Survey Department, Egypt, 1913, and the Royal Geographical Society, under the direction of the Geographical Section of the General Staff, 1916 and 1918, marked with the boundaries of Armenia and Georgia as laid down by the Treaty of Alexandropol, 1920, lines in the Caucasus held by the Turks and by the Bolsheviks, Mar 1921, and boundaries in the Caucasus proposed by Moscow, 1921.

Photocopies of correspondence and photographs, taken from five albums, relating to Sclater's career, 1898-1927, including letter from FM Sir (Henry) Evelyn Wood, Adjutant General to the Forces, confirming Sclater's appointment as Bde Maj, Aldershot, 1898; seventeen copies of photographs and nine sketch maps relating to the Second Boer War, South Africa, 1899-1902, including photographs of Bloemfontein and Brandfort, Orange Free State, and sketch maps of the Battles of Modder River, Nov 1899 and Paardeberg Drift, Feb 1900; two photographs of the 13 pounder Quick Fire gun, newly issued to the Royal Horse Artillery, 1904; letter from Lt Col Rt Hon Arthur John Bigge, 1st Baron Stamfordham, thanking Sclater for congratulatory letter on the award of a peerage to Stamfordham, 1911; three photographs of Indian Army sepoys, 1912; correspondence, 1912- 1917, including letters relating to recruitment, military inspections and the availability of manpower from FM Sir John Denton Pinkstone French, Commander-in-Chief, Home Forces, Feb 1917, Gen Sir (Henry Macleod) Leslie Rundle, General Officer Commanding-in-Chief, Eastern Command, Feb-May 1916, and Lt Gen Sir (Cecil Frederick) Nevil Macready, Adjutant General to the Forces, Jul 1917; letter to Slater from Gen Sir (Francis) Reginald Wingate, relating to riots in Egypt, Jun 1920; letter to Sclater from Lt Gen Sir George Fletcher MacMunn, Quartermaster General, India, dated Jun 1921, relating to the political and military situation in India, particularly in the aftermath of the massacre of 479 Indian civilians by troops of the Indian Army, commanded by Brig Gen Reginald Edward Harry Dyer, Amritsar, Punjab, Apr 1919; printed obituary of Sclater [1927].