Source: Via Mark Carmichael Excel spreadsheet dated September 2025 re. soldiers of the 116th Battalion that served with the 18th.
Family Search: Private William Thomas Mills was born on 11 March 1898, in London, Ontario, Canada as the son of John Henry Mills and Mary McLaughlin. He had at least 2 sons with Beatrice Anderson. He registered for military service in 1915. In 1915, at the age of 17, his occupation is listed as salesman in Kingston, Frontenac, Ontario, Canada. He died in September 1984, in Kingston, Frontenac, Ontario, Canada, at the age of 86.
History of the 18th Battalion CEF, "The Fighting Eighteenth" 