Alonzo W. Clark is listed as a captain in a Union volunteer regiment during the Civil War. Searches of Wikipedia, Find A Grave, and regimental rosters found several men named Alonzo Clark from the era, including an Alonzo Clark (1840–1917) of Company D, 1st U.S. Infantry, but none could be confidently confirmed as sharing the middle initial “W.” or the captain’s rank specified here, so no verified biographical details can be reported for this individual.