The Last Hundred Days refers to the campaign at the end of 1918 that culminated in the defeat of the German Army on the Western Front and the Armistice.
Articles relating to the 18th Battalions involvement in this momentous military achievement will be placed here.
For an overview of the Campaign this source from Veterans Affairs Canada is a good place to start.
History of the 18th Battalion CEF, "The Fighting Eighteenth" 