One of the lasting legacies of the Battle of Antietam was the growth of military medicine.

The battle, known for its unprecedented casualties, highlighted the urgent need for improved medical care on the battlefield. The high number of wounded soldiers prompted advancements in surgical techniques, triage systems, and the establishment of more organized medical corps. Additionally, the experience led to greater awareness of sanitation and the importance of proper medical supplies, ultimately influencing how future conflicts were managed medically and improving care for soldiers.