The 157th (Simcoe Foresters) Battalion, CEF was a unit in the Canadian Expeditionary Force during the First World War. On 30 November 1915, the 35th Simcoe Foresters was authorized to raise the 157th Battalion. Under the command of Lieutenant-Colonel D.H. MacLaren, the 157th was tasked with constructing a new army training camp on the Simcoe Pines Plain, which was to be named Camp Borden. Construction began in May 1916 with the companies from Barrie and Collingwood. A second company from Barrie arrived in June to help speed-up the construction. As such, the 157th became the founding battalion of Camp Borden, which it constructed to accommodate 40 infantry battalions in 10 brigades. Before the Camp was opened the remainder of the 157th and the entire 177th Battalion (Simcoe Foresters), CEF