Enlisted October 18, 1863 at Greenburgh, NY in the 16th Cavalry, also known as the “Sprague Light Cavalry.” The term “light” meant their regiment did not use horse-drawn artillery, but was intended instead for reconnaissance and raids.
At that time, Archie could legally enlist at age 18. His face, while still beardless, indicates his readiness for battle after his previous infantry service. Perhaps we also see an expression of confidence in a young man who survived war wounds.
The Assassin's Assassin 