[2][7][8][9] The regiment was originally formed on 1 April 1910, as the 26th Canadian Horse (Stanstead Dragoons) in Coaticook, Quebec.
On 24 October 1915, the regiment disembarked in France where it fought as part of the 2nd Brigade, Canadian Mounted Rifles.
On 3 January 1916, the regiment was converted to infantry and Redesignated as the 5th Battalion, Canadian Mounted Rifles and was assigned to the 8th Infantry Brigade, 3rd Canadian Division where it fought in France and Flanders until the end of the war in November 1918.
[9] On 15 March 1920, as a result of the Canadian Militia reforms following the Otter Commission, the 26th Stanstead Dragoons were renamed for the final time as The Eastern Townships Mounted Rifles.
For regimental headdress, it consisted gilded helmet and badge (except for enamelled centre and silver scroll) with a black-over-white hair plume.