The South Alberta Light Horse (SALH) is a Canadian Army armoured reconnaissance regiment of the Canadian Army Reserve. It traces its complicated lineage to the Rocky Mountain Rangers, and claims its direct ancestry to the 15th Light Horse, along with various other Alberta based cavalry units. The "Light Horse" designation comes from its light cavalry and mounted infantry origins. The SALH is part of 41 Canadian Brigade Group of the 3rd Canadian Division, and is based in Medicine Hat, Edmonton and Lethbridge, Alberta. History Early history The South Alberta Light Horse traces its beginnings to the period of the Riel Rebellion of 1885. During this conflict the Rocky Mountain Rangers (RMR) of Fort Macleod, which comprised 150 officers and men, were tasked with the protection of the area ranging from the U.S. border to the High River and from the Rockies to Medicine Hat. The RMR saw no action during their three months of existence during the rebellion, and the SALH carries the battle honour "North West Canada, 1885" on their colours. This irregular light cavalry unit is seen as the true genesis of the regiment. The 15th Light Horse, the official direct ancestor of the SALH, was raised in Calgary on July 3, 1905. It consisted of four newly organized cavalry squadrons: Calgary (A Squadron), Fort MacLeod (B Squadron), High River (C Squadron), and Cochrane (D Squadron). From this point until the mid-1950s the regiment's history can be described as a series of complicated amalgamations and redesignations of Alberta army reserve units of all arms until the regiment as it is now was formed in Calgary in 1954. At the beginning of the First World War, the Alberta militia units destined to become part of SALH were four cavalry regiments – 15th Light Horse in Calgary, 19th Alberta Dragoons in Edmonton, 21st Alberta Hussars in Medicine Hat and 23rd Alberta Rangers in Fort Macleod – and two infantry regiments (101st Regiment "Edmonton Fusiliers" and 103rd Regiment "Calgary Rifles"). WWI and interregnum In the First World War, instead of mobilising the Canadian militia to send overseas, new units were formed from volunteers of the militia and general public. The militia units generally became organizations for recruiting, induction and preliminary training for the new units. The 19th Alberta Dragoons recruited the 1st Divisional Cavalry Squadron, CEF, which landed in France in February 1915. After other divisions joined the 1st Canadian Division