Source: Via Katherine Cross at the 18th Battalion Facebook Group.
Charles W. Boyd
Lieutenant, 18th Battalion, C.E.F.
Enlisted in September 1915, as a Private in the 59th Battalion, and in June 1916, he went to France where he was attached to the 18th Battalion. In April, 1918, he was promoted to the rank of Lieutenant. He was severely wounded in July 1917, and he was gassed at Passchendaele in November, 1917.
Source: Memorial of the Great War, 1914-1918 : a record of service by Bank of Montreal Published 1921. Page 149.