National Archives of Canada: War Diaries of the First World War contains the digitised War Diaries of the Canadian Expeditionary Force (CEF) units. From the start of the First World War, CEF units were required to maintain a daily account of their "Actions in the Field." This log was called a War Diary. The War Diaries are not personal diaries, rather they are a historical record of a unit's administration, operations and activities during the First World War