Canadian Expeditionary Force

Canadian Expeditionary Force
Active	1914–1919
Country	Canada
Role	Expeditionary warfare
Size	619,646 men (total)
Nickname(s)	CEF
Engagements	World War I Western Front North Russia Intervention Siberian Intervention
Commanders
Notable commanders	Lieutenant General Edwin Alderson Lieutenant General Julian Byng Lieutenant General Arthur Currie

The Canadian Expeditionary Force (CEF) was the expeditionary field force of Canada during the First World War. It was formed following Britain’s declaration of war on the German Empire on 15 August 1914, with an initial strength of one infantry division. The division subsequently fought at Ypres on the Western Front, with a newly raised second division reinforcing the committed units to form the Canadian Corps. The CEF and corps was eventually expanded to four infantry divisions, which were all committed to the fighting in France and Belgium along the Western Front. A fifth division was partially raised in 1917, but was broken up in 1918 and used as reinforcements following heavy casualties.