Source: Taken on strength with Battalion on August 13, 1917 in the Lens Sector.
Family Search: When Lieutenant Hunter Charles Duff was born on 23 January 1882, in Barton, Wentworth, Ontario, Canada, his father, William Alexander Hamilton Duff, was 35 and his mother, Barbara Almira Brown, was 39. He married Clarissa Hester Sage on 15 February 1911, in London, Canada West, British North America. He lived in London, Ontario, Canada in 1915 and Toronto, York, Ontario, Canada in 1931. He registered for military service in 1915. In 1931, at the age of 49, his occupation is listed as salesman in Toronto, York, Ontario, Canada. He died on 13 December 1957, in Toronto, Ontario, Canada, at the age of 75, and was buried in Woodland Cemetery, London, Ontario, Canada.
History of the 18th Battalion CEF, "The Fighting Eighteenth" 