Soldiers' letters home during the Battle of Antietam served primarily as a morale booster for both the soldiers and their families.

These letters allowed soldiers to communicate their experiences, thoughts, and feelings about the battle, helping to maintain a connection with loved ones. The personal accounts often conveyed hope and resilience, reinforcing the idea of sacrifice for a greater cause. Families back home found comfort in these communications, which could alleviate fears and provide updates on the well-being of their loved ones. Overall, these letters played a crucial role in sustaining morale on both fronts during the war.