The 18th (Eastern) Division was an infantrydivision of the British Army formed in September 1914 during the First World War as part of the K2 Army Group, part of Lord Kitchener's New Armies. From its creation the division trained in England until 25 May 1915 when it landed in France and spent the duration of the First World War in action on the Western Front, becoming one of the elite divisions of the British Army. During the Battle of the Somme in the latter half of 1916, the 18th Division was commanded by Major GeneralIvor Maxse.
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)