The result of the Battle of Antietam for the Union Army's reputation was an enhanced prestige.

Although the battle was one of the bloodiest in American history, it marked the first significant Union victory against General Lee’s forces, providing a much-needed boost to Northern morale. The tactical draw allowed President Lincoln to issue the Emancipation Proclamation, further solidifying the Union's commitment to ending slavery. This victory also improved public perception of the Union Army, as it demonstrated their ability to confront and withstand the Confederate threat.