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The Grenville Regiment (Lisgar Rifles) originated in Prescott, Ontario on 12 April 1867, when the '56th "Prescott" Battalion of Infantry' was authorized to be formed. It was redesignated: '56th "Grenville" Battalion of Infantry' on 9 August 1867; '56th Grenville Battalion of Rifles' on 13 September 1871; '56th Grenville Battalion "Lisgar Rifles"' on 29 September 1871; '56th Grenville Regiment "Lisgar Rifles"' on 8 May 1900; and 'The Grenville Regiment (Lisgar Rifles)' on 12 March 1920. On 15 December 1936, it was amalgamated with the '56th Field Battery, RCA