Source: 18th Battalion Nominal Roll, April 1915.
Family Search: When William Alexander McKen was born on 10 May 1889, in Alma, Pilkington Township, Wellington, Ontario, Canada, his father, John McKen, was 25 and his mother, Barbara Bruce Thomson, was 23. He lived in Guelph, Wellington, Ontario, Canada in 1914 and Harwich, Kent, Ontario, Canada in 1921. He registered for military service in 1914. In 1914, at the age of 25, his occupation is listed as postman. He died on 14 October 1950, in Ypsilanti, Washtenaw, Michigan, United States, at the age of 61, and was buried in Woodlawn Memorial Park, Guelph, Wellington, Ontario, Canada.
War Diary of the 18th Battalion CEF 