in France and the Canadian Corps was formed, the squadron was attached to the corps and became A Squadron, Canadian Light Horse, CEF. The troopers of this squadron wore 19th Alberta Dragoon badges throughout the war.Also recruited by SALH's predecessors were three regiments of Canadian Mounted Rifles (CMR): the 3rd, 12th and 13th. The 3rd Regiment, Canadian Mounted Rifles, CEF, was mobilized at Medicine Hat and landed in France in September 1915 as part of the 1st CMR Brigade. At the end of 1915, the CMR units in France were converted from two cavalry brigades (six regiments) into one infantry brigade (four battalions). The troopers of the 3rd Regiment were split up, half going to the 1st CMR Battalion and half to the 2nd CMR Battalion; both these battalions fought in the 3rd Canadian Division. The 12th and 13th Regiments CMR were broken up for reinforcements in England. The SALH also counts a First World War artillery unit as an ancestor: 22nd (Howitzer) Battery, CFA, CEF. The battery landed in France on 19 January 1916, where it served as part of the 6th Brigade, 2nd Canadian Divisional Artillery until the end of the war. The battery was demobilized at Hamilton, 25 May 1919, and was disbanded on 1 November 1920. The battery is perpetuated by the 22nd Field Battery, RCA, Gleichen Alberta. Of the eight infantry battalions recruited by the SALH's predecessors, only one entered combat as a unit. The 31st Battalion, CEF, landed in France in September 1915 with the 2nd Canadian Division. It was awarded 22 battle honours, including such notable actions as Vimy and Passchendaele. The other seven battalions – 9th, 66th (Edmonton Guards), 113th Battalion (Lethbridge Highlanders), CEF, 138th (Edmonton), 175th (Medicine Hat), 187th (Central Alberta) and 202nd (Sportsman's) – were broken up for reinforcements in England. The 31st Battalion (part of the 6th Infantry Brigade) participated in the first tank attack in history at the Battle of Flers-Courcelette on 15 September 1916, while A Squadron, Canadian Light Horse, made the last cavalry charge in Canadian history at the battle of Iwuy on 10 October 1918. This means that among the predecessor units of the SALH, one participated in the first military operation involving the tank and another mounted the last cavalry charge in Canadian history. The period between the world wars saw two major reorganizations of the Canadian Militia, the first from 1920 to 1924