Sub-series consists of records created and/or maintained by the 26th Canadian Infantry Battalion, and document many aspects of the battalion's activities.
Volume 4121 includes the following files: Administration instructions, 21 Oct - 18 Dec 1917 (folder 1, file 1); Allotment of land for agriculture, 14 March 1917 - 4 Feb 1918 (folder 1, file 2); Aircraft, 6 July 1917 - 10 March 1918 (folder 1, file 3); Small arms and ammunition, 24 March 1916 - 1 March 1918 (folder 1, file 4); Artillery, 19 Jan 1916 - 22 Jan 1918 (folder 1, file 5); Good conduct badges, 24 Sept 1916 (folder 1, file 6); Billets and billeting, 10 July 1917 - 13 March 1918 (folder 1, file 7); Bombs and grenades, 21 Aug 1917 - 31 Jan 1918 (folder 1, file 8); Burials and cemeteries, 31 Aug-19 Oct 1917 (folder 1, file 9); Casualties, 6 Sept 1915 - 31 Dec 1918 (folder 1, files 10-13); Claims re property damage, 15 Dec 1916 - 31 March 1917 (folder 1, file 14); Clothing and equipment, 17 March 1917 (RG 9, III, Vol. 4121, file 1, file 15); Codes, 15 Sept-8 Dec 1917 (RG 9, III, Vol. 4121, file 1, file 16); Lecture re battle of Ypres, 12 Oct 1917 - 5 March 1918 (folder 1, file 17); Defences, 1915-1918 (folder 2, files 1-3); Defence schemes, 1917 (folder 2, files 4-5); Discipline, 3 Feb 1916 - 23 Nov 1917 (folder 2, file 6); Dispositions, 30 Jan-22 Feb 1918 (folder 2, file 7); Establishment returns, 24 Nov 1917 (folder 2, file 8); Gas, 23 May 1915 - 6 March 1918 (folder 2, file 9); Machine and Lewis guns, 26 Sept 1916 - 2 Aug 1918 (folder 2, file 10); Honours and awards, 12 Jan-5 April 1916 (folder 2, file 11); Intelligence, other than summaries, 2 Aug 1917 - 14 Feb 1918 (folder 2, file 12); Correspondence re maps, 8 Sept 1917 - 7 March 1918 (folder 2, file 13); Medical: trench foot, 6 Oct 1917 (folder 2, file 14); Artillery memorial, Vimy Ridge, 30 Dec 1917 (folder 2, file 15); Mining, 2 Aug 1917 (folder 2, file 16); Moves and reliefs, 17 Nov 1915 - 22 Nov 1917 (folder 2, file 17).
Volume 4122 includes the following files: Nominal rolls, 2 Nov 1914 - 21 June 1916 (folder 3, file 1); Officers, 22 Oct 1915 - 3 Jan 1918 (folder 3, file 2); Operations. Wytschate - Messines (Kemmel), 11-12 Oct 1915 (folder 4, file 1); Operations. Mount Sorrel, 5 June 1916 (folder 4, file 2); Operations. Hill 70, 15 Aug - 14 Sept 1917 (folder 4, file 3); Operations. Passchendaele, 29 Oct-26 Nov 1917 (folder 4, file 4); Minor operations, 6 July-22 Nov 1916 (folder 4, file 8); Minor operations, 7 Feb-6 March 1918 (folder 4, file 9); Minor operations, German report re, 3 Dec 1917 - 14 Jan 1918 (folder 4, file 12); Operation orders, 1915-1918 (folder 4, files 13-15); Routine orders, 1915-917 (folder 4, files 16-20); Battalion orders, Pts I and II, 13 April-9 Sept 1915 (folder 5, files 1-2).
Volume 4123 includes the following files: Battalion orders, Pts I and II, 17 Oct 1915 - 26 Dec 1917 (folder 6, files 1-3); Patrol reports, 24 Jan 1917 - 24 Jan 1918 (folder 7, file 1); Paymasters' correspondence, 19 Dec 1916 - 12 March 1917 (folder 7, file 2); Supernumerary NCOs, 5 June- 4 Dec 1917 (folder 7, file 3); Official photographers, 20 Oct 1917 (folder 7, file 4); Correspondence re aeroplane photos, 31 Jan 1918 (folder 7, file 5); Pigeon services, 22 Oct - 14 Nov 1917 (folder 7, file 6); Cdn prisoners of war, 24 July - 29 Nov 1917 (folder 7, file 7); Scheme of obtaining information by means of coal gas balloons, 10 Oct 1917 - 5 Feb 1918 (folder 7, file 8); Movement of troops on light railways, 25 Nov 1917 (folder 7, file 9); Rations, 22 Feb 1918 (folder 7, file 10); Reconnaissance, 26 Jan - 4 March 1918 (folder 7, file 11); Reinforcements, 22 Nov 1917 (folder 7, file 12); Remounts, 13 March-26Aug 1918 (folder 7, file 13); Sanitation, 30 April 1916 - 27 Dec 1917 (folder 7, file 14); Salvage, 17-22 Dec 1917 (folder 7, file 15); Signal service, 25 April 1916 - 10 March 1918 (folder 7, file 16); Signals, 9 Sept-2 Dec 1917 (folder 7, file 17); Trench stores, 9 March 1916 - 23 Jan 1918 (folder 7, file 18); Stores, 9 July 1917 - 29 Aug 1917 (folder 7, file 19); Strength, 16 Sept 1915 - 28 Nov 1917 (folder 7, file 20); Training, 14-30 June 1917 (folder 7, file 21); Transport and traffic, 26 Nov 1917 - 15 Feb 1918 (folder 7, file 22); Trophies, 31 May - 30 Nov 1917 (folder 7, file 23); Correspondence re war diaries, 25 July 1916 - 21 Dec 1917 (folder 7, file 24).