The 3rd Regiment, Canadian Mounted Rifles, CEF, was authorized on 7 November 1914, embarked for England on 12 June 1915 and fought in France as from 22 September 1915 as part of the 1st Canadian Mounted Rifles Brigade until absorbed by the 1st Battalion and 2nd Battalion, Canadian Mounted Rifles on 31 December 1915.
The 3rd Regiment, Canadian Mounted Rifles, CEF was formed on November 7, 1914, embarked for England on June 12, 1915, and participated in the French campaign from September 22, 1915, as part of the 1st Canadian Mounted Rifles Brigade until absorbed into the 1st Battalion and 2nd Battalion, Canadian Mounted Rifles on December 31, 1915.