Westminster Dragoons
1/2nd
August 1914 : in London, attached to the London Mounted Brigade.
September 1914 : moved independently to Egypt
January 1915 : formed the Yeomanry Mounted Brigade with the 1/1st Hertfordshire Yeomanry
August 1915: dismounted to Gallipoli, attached to 2nd Mounted Division; Brigade redesignated 5th Mounted Brigade.
December 1915 : returned to Egypt, remounted, and left Division.
April 1916: attached to 6th Mounted Brigade in Western Frontier Force (desert).
January - August 1917 : squadrons and RHQ split up; RHQ and C to Northern Canal Defences; A Sqn attached to 53rd Division in Jan'Feb and 74th Division later; B Sqn was at Depot.
August 1917 : Regiment reformed and became XX Corps Cavalry Regiment
April 1918 : became "F" Battalion, Machine Gun Corps
June 1918 : moved via Italy to France
August 1918 : renumbered 104 Bn, Machine Gun Corps, attached to Second Army.
2/2nd
Formed August 1914, but history obscure.
3/2nd
Formed in 1915. Remained in United Kingdom until absorbed by 4th Reserve Cavalry Regiment in Ireland.