The Union Second Corps played a key role in the fighting at the Battle of Antietam.

Commanded by Major General Edwin V. Sumner, this corps was instrumental in several critical assaults, particularly in the center of the battlefield. They faced intense resistance from Confederate forces and engaged in fierce combat at locations such as the Cornfield and the Sunken Road. The Second Corps' actions were vital in holding their ground and applying pressure on Confederate lines, contributing significantly to the battle's overall intensity. Their efforts exemplified the bravery and determination of Union soldiers during this pivotal moment in the Civil War.