The first Union Victory of the Civil War came at Antietam.
During the battle of Antietam, the both the Union and the Confederates were locked in a stalemate but because the Confederates withdrew from the battle first, it meant that the Union won a victory as they ended a Northern invasion by the Confederates.
This battle led to:
- President Lincoln being able to issue the Emancipation Proclamation
- Gen. George B. McClellan being relieved of his duties as the Union commander when he failed to press home the advantage.
- European support for the Confederacy evaporating
In conclusion, the first union victory at Antietam was very significant.
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