1/1st

August 1914 : in Colchester. Part of the Eastern Mounted Brigade, in 1st Mounted Division.

In November 1914, left the Brigade and moved independently to France, where it joined the 8th Cavalry Brigade, 3rd Cavalry Division. Left in March 1918.

March 1918 : a plan to convert the Regiment to a Cyclist unit was dropped in favour of making it into a machine-gun battalion, together with troops from the Bedfordshire Yeomanry. However within days this plan was also dropped, and the regiment remounted and joined the 1st Cavalry Division.

April 1918 : Regiment split up: one Squadron went to each Regiment of the 1st Cavalry Division.

2/1st

Formed September 1914, and remained in UK until in September 1917, converted into a Cyclist unit. Moved to Ireland in early 1918.

3/1st

Formed in 1915. Remained in United Kingdom until disbanded in early 1917.