Source: 18th Battalion Nominal Roll, April 1915.
Find-A-Grave
Family Search: When Private Charles Underwood was born on 15 September 1883, in Carlton, Nottinghamshire, England, United Kingdom, his father, Joseph Underwood, was 34 and his mother, Elizabeth Huckerby, was 31. He immigrated to Detroit, Wayne, Michigan, United States in 1914 and lived in Detroit, Wayne, Michigan, United States in 1919 and Mumbai, Maharashtra, India in 1922. In 1914, at the age of 31, his occupation is listed as machinist.
Best man for Private Frederick Edmund Sample.
History of the 18th Battalion CEF, "The Fighting Eighteenth" 