Family Search: When Private Oliver Chester Ellis was born on 12 July 1898, in Bothwell, Chatham-Kent, Ontario, Canada, his father, Chester Ellis, was 41 and his mother, Margaret Duncan, was 37. He registered for military service in 1915. In 1915, at the age of 17, his occupation is listed as labourer in Chatham, Kent, Ontario, Canada. He died on 15 September 1919, in Sainte-Anne-de-Bellevue, Jacques-Cartier, Quebec, Canada, at the age of 21, and was buried in Mount Pleasant Cemetery, Thamesville, Chatham-Kent, Ontario, Canada.
History of the 18th Battalion CEF, "The Fighting Eighteenth" 