The 69th Overseas Battalion, CEF, or Canadian Expeditionary Force, was formed, 1 July 1915 by Lieutenant Colonel J. Adolphe Dansereau in Montreal, Quebec. Following training in St. John, New Brunswick, the 69th left for overseas in April 1916. On arrival in England they formed part of the newly created 10th Reserve Battalion to have reinforcements for other units in France. On 20 September 1920, the 69th was officially disbanded.