1/1st

August 1914 : in Beverley, part of the Yorkshire Mounted Brigade.

Early 1915 : left the Brigade and joined 2nd Northumbrian Division.

May 1915 : transferred to 1st Mounted Division.

October 1915 : moved for Salonika, but orders received while at sea diverted the Brigade to Egypt.

April 1916 : Brigade redesignated 22nd Mounted Brigade. Attached to Western Frontier Force.

February 1917 : Brigade moved to ANZAC Mounted Division.

June 1917 : Brigade moved to Yeomanry Mounted Division, which was redeisgnated (after a short period as 1st Mounted Division) the 4th Cavalry Division, and the Brigade became 12th Cavalry Brigade.

7 April 1918 : left the Brigade, dismounted and formed D Battalion, Machine Gun Corps, with the 1/1st Lincolnshire Yeomanry. Moved to France, landing 1 June 1918, and attached to First Army.

2/1st

Formed September 1914, and remained in UK until May 1918 when moved to Ireland. Converted into a cyclist unit in July 1916.

3/1st

Formed in 1915. Remained in United Kingdom until absorbed into 1st Reserve Cavalry Regiment in early 1917.