This useful book covers the Army Corps of all campaigns and theatres of the First World War. In the army's hierarchy the Army Corps sat above and commanded the Divisions. The Army Corps of WW1 were large organisational formations used to manage divisions, artillery and logistical support. In 1914 there was an expectation of a small Expeditionary Force with no need for any formation larger than a division. This idea was soon disabused and several Corps came into existence. As the war progressed, the British formed many Corps across the theatres and campaigns. This is a brief history of each Corps, with profiles of commanders, a list of Divisions in each Corps, battle honours and headquarter locations. It does not cover units and regiments, such as the Tank Corps or Royal Army Medical Corps that have 'Corps'in their titles.