Source: September 1918 casualty.
Family Search: When Private John Francis Duffy was born on 13 October 1895, in Alvinston, Lambton, Ontario, Canada, his father, John Duffy, was 29 and his mother, Margaret Bowie, was 30. He lived in Lambton, Ontario, Canada in 1901. He registered for military service in 1916. In 1916, at the age of 21, his occupation is listed as farmer in Alvinston, Lambton, Ontario, Canada. He died on 2 September 1918, in Mingoval, Pas-de-Calais, Nord-Pas-de-Calais, France, at the age of 22, and was buried in Aubigny Communal Cemetery Extension, Aubigny, Pas-de-Calais, Nord-Pas-de-Calais, France.
History of the 18th Battalion CEF, "The Fighting Eighteenth" 