Source: Per research by 160th Battalion Facebook Group. Confirmed served with 18th Battalion.
Family Search: Private William Jackson was born on 1 May 1899, in Gloucestershire, England, United Kingdom. He married Elsie Ethel Tanner on 22 December 1921, in Teeswater, Bruce, Ontario, Canada. He immigrated to Canada in 1915. He registered for military service in 1916. In 1916, at the age of 17, his occupation is listed as farm labourer in Teeswater, Bruce, Ontario, Canada. He died on 10 July 1968, in London, Ontario, Canada, at the age of 69
History of the 18th Battalion CEF, "The Fighting Eighteenth" 