On 15 August 1913, the 11th Regiment Irish Fusiliers of Canada was authorized for service. The regiment had its headquarters and companies in Vancouver.[1][6]
On 6 August 1914, the 11th Regiment Irish Fusiliers of Canada was placed on active service for local protection duties.[2]
On 22 December 1915, the 121st Battalion (Western Irish), CEF, was authorized for service, and on 14 November 1916 the battalion embarked for Great Britain. After its arrival in the UK, the battalion provided reinforcements for the Canadian Corps in the field. On 10 January 1917, the battalion’s personnel were absorbed by the 16th Reserve Battalion, CEF. Finally on 17 July 1917, the 121st Battalion, CEF, was disbanded.[2]
On 15 March 1920, as a result of the Otter Commission and the following post-war reorganization of the Canadian Militia, the 11th Regiment Irish Fusiliers of Canada was redesignated as The Irish Fusiliers of Canada and was reorganized with 2 battalions (1 of them a paper-only reserve battalion) to perpetuate the assigned war-raised battalions of the Canadian Expeditionary Force.[1][7]