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A Corps was a formation of the Army that in 1914 was composed of 2 Divisions, with a Signals Cable Section of the Royal Engineers. It was properly titled an 'Army Corps', but the full name was usually shortened. Corps, normally commanded by a Lieutenant-General, reported up to GHQ, and later, to Army HQ. (Although in the smaller theatres, Corps usually reported to HQ or GHQ). The Corps HQ consisted of 18 officers and 71 other ranks. The Divisions were permanently attached to their Corps. For example, the II Corps, of the first contingent of the BEF that fought at the Battle of Mons consisted of 3rd and 5th Divisions.

However, as the army grew in size the composition of the Corps changed considerably.

The number of Divisions under the command of the Corps remained nominally at two, but could be increased if fighting conditions required. Divisions were moved from Corps to Corps as they came in and out of the line, and were moved from place to place. The Corps HQ generally remained fixed in place, while the Divisions were moved around. Corps were gradually given more responsibility for the supply lines and other features of their area, so the specialist units directly under Corps command also increased. The latter included heavy artillery, from April 1916 onwards.

By the late stages of the war, Corps HQ had grown to consist of 50 officers and 141 other ranks. Corps troops included a cavalry regiment, the heavy artillery (including a motor transport company), a heavy trench mortar battery, a cyclist battalion, signal troops, a motor transport column, mobile workshops of the Army Ordnance Corps an an Area Employment Company. In all, this would amount to perhaps 2000 officers and men, depending on the Divisions under command at any time. The establishment varied in theatres other than the Western Front, and were generally smaller.

The average Tommy rarely knew which Corps he was in. Firstly he was moved among them at frequent intervals, and secondly the Corps rarely had a 'character' of its own, due to the temporary nature of its make-up.

Corps were always identified by Roman numerals.

 
The British Corps formed during the Great War
For a complete listing of all British Corps and the battles they fought, click here
 
The usual British idiosyncrasies
The Royal Artillery and the Royal Engineers are also known as the Corps of Royal Artillery, and the Corps of Royal Engineers. There are also the Machine Gun Corps, the Tank Corps, the Army Pay Corps, the Army Ordnance Corps, the Royal Army Medical Corps, and the Army Service Corps. The designation 'Corps' in these cases has nothing to do with the order of battle hierarchy as described above, and is used similarly to the word 'Regiment' in the infantry. It's all to do with long history, and esprit-de-corps ;-)
 
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