Source: Per post by Allan Miller at the 149th Battalion CEF- Lambton’s Own Facebook Group.
Find-A-Grave
Family Search: When William Cecil Mckinnon was born on 12 May 1896, in Brussels, Huron, Ontario, Canada, his father, Hugh Mckinnon, was 51 and his mother, Isabella McKay, was 36. He lived in Huron, Ontario, Canada for about 10 years and Toronto, York, Ontario, Canada in 1921. He registered for military service in 1915. In 1915, at the age of 19, his occupation is listed as bank clerk, bank of nova scotia in Brigden, St. Clair, Lambton, Ontario, Canada.
Resignation letter from Bank of Nova Scotia Roll of Honour.
History of the 18th Battalion CEF, "The Fighting Eighteenth" 