The Union won but at very heavy costs. Many died on both sides but the south eventually surrendered.
Union
The Union had victory!both sides claimed victory but it was the union who actually won
Lincoln announced the Emancipation Proclamation after the Union victory at the Battle of Antietam.
The battle of Fredericksburg was not a Union victory but a fiasco. It showed that Burnside had been promoted above his level of incompetence.
It was a Union victory.
the battle was a strategic union victory.
A Union Army victory, in the battle field.
It was a Union victory, sometimes considered to be a "decisive victory" (meaning it had a major impact on how the war ended).
Tenn
Union Victory
Unfortunately it was but it also was the South's first attack on the North that resulted in a Union victory.
Battle of Shiloh