 The 9th Battalion, CEF, was authorized on 10 August 1914 and embarked for Britain on 1 October 1914, where it was redesignated as the 9th Reserve Infantry Battalion, CEF, on 29 April 1915, to provide reinforcements for the Canadian Corps.The battalion was formally disbanded on 15 September 1917.The 66th Battalion (Edmonton Guards), CEF, was authorized on 20 April 1915 and embarked for Britain on 28 April 1916 where its personnel were absorbed by the 9th Reserve Battalion, CEF on 7 July 1916 to provide reinforcements for the Canadian Corps.