Abstract This collection contains thirty-five letters written between April 29, 1864 – December 24, 1864 that record the experiences of Horace Killam, an 18-year-old Union soldier from Boxford, Massachusetts. Killam joined the 59^th Massachusetts Infantry in April 1864, participated in Battle of Spotsylvania, was a prisoner war, and died in a parole camp in Annapolis, Maryland.