Source: “Duty Nobly Done” page 270.
Family Search: When Private Henry Jack was born on 2 July 1888, in Alma, Mapleton, Wellington, Ontario, Canada, his father, Alexander Jack, was 43 and his mother, Margaret Scott, was 42. He lived in Bruce, Ontario, Canada for about 10 years and Paisley, Bruce, Ontario, Canada in 1916. He registered for military service in 1916. In 1916, at the age of 28, his occupation is listed as salesman in Paisley, Bruce, Ontario, Canada. He died on 18 July 1918, in Arras, Pas-de-Calais, France, at the age of 30, and was buried in Wancourt British Cemetery, Wancourt, Pas-de-Calais, Nord-Pas-de-Calais, France.
Blog post about his death. He was a temporary prisoner of war (POW).
Became a prisoner of war (POW) July 18, 1918. The other soldier taken prisoner was Private James Thomas Fishel, reg. no. 929039. Private Fishel survived the war. Private Henry Jack is recorded to have been killed while escaping his German captors.
History of the 18th Battalion CEF, "The Fighting Eighteenth" 