Trench Mortar Battery (joined 17 June 1916) Divisional Troops 6th (Service) Battalion, Northamptonshire Regiment (left November 1914) 10th (Service) Battalion, Royal Fusiliers (joined October 1914, left March 1915) 8th (Service) Battalion, Royal Sussex Regiment (joined as Pioneer Battalion in February 1915 from 54th Brigade) 15th Motor Machine Gun Battery (joined 22 July 1915, left 4 May 1916) 18th Battalion Machine Gun Corps (M.G.C.) (formed 16 February 1918 absorbing brigade MG companies) Divisional Mounted Troops C Sqn, Westmorland and Cumberland Yeomanry (joined 15 June 1915, left 10 May 1916) 18th Divisional Cyclist Company, Army Cyclist Corps (formed 8 December 1914, left 21 May 1916) 18th Divisional Train Army Service Corps 150th, 151st, 152nd and 153rd Companies 30th Mobile Veterinary Section Army Veterinary Corps 219th Divisional Employment Company (joined 3 June 1917) Royal Artillery LXXXII Brigade, Royal Field Artillery (R.F.A.) LXXXIII Brigade, R.F.A. LXXXIV Brigade, R.F.A. (left 25 January 1917) LXXXV (Howitzer) Brigade, R.F.A. (broken up 3 December 1916) 18th Divisional Ammunition Column R.F.A. 18th Heavy Battery, Royal Garrison Artillery (raised with the Division but moved independently to Egypt in October 1915) V.18 and W. 18 Heavy Trench Mortar Batteries R.F.A. (V battery formed 28 April 1916, left for II Corps on 19 February 1918. W battery formed 21 May 1916, but broken up by 26 November 1916) X.18, Y.18 and Z.18 Medium Mortar Batteries R.F.A. (formed 19 June 1916, Z battery broken up 19 February 1918 and distributed to X and Y batteries) Royal Engineers 79th Field Company 80th Field Company 92nd Field Company 18th Divisional Signals Company Royal Army Medical Corps 54th Field Ambulance 55th Field Ambulance 56th Field Ambulance 35th Sanitary Section (left 24 March 1917) Battles Battle of the Somme (1916) Battle of Albert Capture of Trônes Wood: 14–15 July 1916. Battle of Delville Wood Battle of Thiepval Ridge Battle of the Ancre Heights Battle of the Ancre Third Battle of Ypres Battle of Épehy Commanders Footnotes See also List of British divisions in World War I Alan Brooke, 1st Viscount Alanbrooke, who served with this division from 1916−1917 and ultimately rose to become Chief of the Imperial General Staff (CIGS) during the Second World War References External links The British Army in the Great War: The 18th (Eastern) Division Further reading Infantry divisions of the British Army in World War I Kitchener's Army divisions Military units and formations established in 1914 Military units and formations disestablished in