List of corps cavalry regiments of the British Army 1916–19
This list includes cavalry regiments assigned to Corps of the British Army in the period 1916–19. On the outbreak of World War I the establishment of a British infantry division included a cavalry squadron for reconnaissance and escort duties. From 1915 these were primarily provided by mounted units of the Special Reserve or Yeomanry regiments of the Territorial Force. Early in 1916 the divisional cavalry squadrons were transferred to Army Corps level and formed into composite regiments. However, Trench warfare conditions on the Western Front reduced the utility of mounted troops, and in 1917 most of the corps cavalry regiments were dismounted and drafted as infantry reinforcements, converted into corps cyclist battalions or machine gun battalions. A few were reinstated during 1918. On the other fighting fronts corps cavalry units continued until demobilisation in 1919. The corps cavalry units formed during the war were as follows:
- Cavalry Corps Troops: B Squadron 1/1st Hampshire Yeomanry ; 1/1st Yorkshire Dragoons
- I Corps Cavalry Regiment: 1st South Irish Horse ; B Sqn 1st King Edward's Horse
- II Corps Cavalry Regiment: 1/1st Yorks Dragoons 12 May 1916–October 1917) – transferred to Cavalry Corps; returned as II Corps Cyclist Battalion
- III Corps Cavalry Regiment: Regimental Headquarters and D Sqn 1/1st Royal Wiltshire Yeomanry ; RHQ, C & D Sqns Duke of Lancaster's Own Yeomanry#1/1st [Duke of Lancaster's Own Yeomanry|1/1st Duke of Lancaster's Own Yeomanry], C Sqn 1/1st Surrey Yeomanry ; C Sqn 1st KEH
- III Corps Cavalry Regiment: D Sqn 1/1st Hertfordshire Yeomanry, 1 Sqn 10th Lancers, 2 Sqns 32nd Lancers
- IV Corps Cavalry Regiment: 1st KEH ; 1/1st Northumberland Hussars
- V Corps Cavalry Regiment: RHQ, A & B Sqns 1/1st Queen's Own Royal Glasgow Yeomanry, B Sqn 1/1st Lothians and Border Horse ; XIX Corps Cavalry Regiment transferred – converted to V Corps Cyclist Battalion
- VI Corps Cavalry Regiment: 1/1st Northamptonshire Yeomanry ; B Sqn Herts Yeomanry – transferred to VIII Corps Cavalry Rgt
- VII Corps Cavalry Regiment: 1st North Irish Horse – redesignated XIX Corps Cavalry Rgt
- VIII Corps Cavalry Regiment: 1/1st Lancashire Hussars ; B Sqn Herts Yeomanry – transferred to Egypt, then XXI Corps Cavalry Rgt
- IX Corps Cavalry Regiment: A & B Sqns 1/1st RWY ; C Sqn 1/1st Hants Carabiniers ; RHQ 1/1st Hants Carabiniers ; A & B Sqns 1/1st Hants Carabiniers ; A & B Sqns SIH
- X Corps Cavalry Regiment: C Sqn NIH, S Sqn 6th Dragoons and B Sqn NIH
- XI Corps Cavalry Regiment: 1/1st Westmorland and Cumberland Yeomanry ; Corps served in Italy from 1 December 1917 to 13 March 1918: 1st KEH
- XII Corps Cavalry Regiment: In Macedonia: A & D Sqns 1/1st L&BH
- XIII Corps Cavalry Regiment: 1/1st Northumberland Hussars ; C Sqn 1st KWH ; 1/1st Northumberland Hussars
- XIV Corps Cavalry Regiment: A & B Sqns 2nd KEH, S Sqn 21st Lancers ; Corps transferred to Italy 5 November 1917: 1/1st Northants Yeomanry ; Corps became GHQ British Force in Italy 18 April 1918 and Corps Cavalry became GHQ Troops
- XV Corps Cavalry Regiment: A & B Sqns SIH ; 1/1st RWY
- XVI Corps Cavalry Regiment: In Macedonia: A & B Sqns 1/1st Surrey Yeomanry
- XVII Corps Cavalry Regiment: 1/1st Yorkshire Hussars, B Sqn 1/1st Surrey Yeomanry ; transferred to Macedonia, then XVI Corps Cavalry Rgt
- XVIII Corps Cavalry Regiment: A & B Sqns SIH, B Sqn Herts Yeomanry, F Sqn ; 1st KEH
- XIX Corps Cavalry Regiment: 2/1st Northumberland Hussars – transferred to V Corps, replaced by VII Corps Cavalry Regt
- XX Corps Cavalry Regiment: in Palestine campaign|Palestine]: Westminster Dragoons#1/2nd [County of London Yeomanry|1/1st Westminster Dragoons] ; 1/1st Worcestershire Yeomanry
- XXI Corps Cavalry Regiment: In Palestine: A Sqn 1/1st DLOY, A Sqn 1/1st Herts Yeomanry, C Sqn QORGY ; B Sqn 1/1 Herts replaced C Sqn QORGY
- XXII Corps: Not formed until 31 December 1917, no cavalry assigned
- XXIII Corps: Did not serve overseas
- XXIV Corps: Never completed formation