Corporal Harlan P. Hodgdon is listed as being in the 10th New Hampshire Volunteer Infantry (where he was made a Corporal from a Private), the 28 Co., 2 Battalion Veteran Res. Corps., and the 15 Veteran Res. Corps in the Civil War.

Enlisted as a Private on 21 May 1861 at the age of 25 Enlisted in Company K, 2nd Infantry Regiment New Hampshire on 08 June 1861. Received a disability discharge Company K, 2nd Infantry Regiment New Hampshire on 01 August 1861 in Washington, DC. 20