Early history

The regiment was originally formed on 1 April 1910, as the 26th Canadian Horse (Stanstead Dragoons) in Coaticook, Quebec. It had squadrons located in Coaticook, Magog, Stanstead and Ayer's Cliff.^[1][6]

On 3 September 1912, the regiment was renamed as the 26th Stanstead Dragoons.^[10][11]

The Great War

On 7 November 1914, the 5th Regiment, Canadian Mounted Rifles was authorized for service and on 18 July 1915, the regiment embarked for Great Britain. 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. On 30 August 1920, the battalion was disbanded.^[9]

1920s-1930s

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.^{[1][2][11][12]}

On 14 December 1936, as part of the 1936 Canadian Militia reorganization,^[13] The Eastern Townships Mounted Rifles were converted to artillery and became the 27th Field Brigade, RCA (later redesignated as the 27th Field Artillery Regiment, Royal Canadian Artillery - now on the Supplementary Order of Battle).^{[1][2][14][15]}