Antietum
(New respondent)
No. Antietam was a Union victory, although entirely accidental, and not followed-up with the capture of Lee's whole army, as Lincoln thought it should have been. The battle is classified as a "technical" victory for McClellan.
It was also a very decisive event, because it gave to Lincoln what he believed to be the credibility to issue the Emancipation Proclamation, which made it impossible for Britain to recognize the South. Britain did however continue to build and sell warships to the Confederacy.
As for battles that were not Union victories, well there are a number of those. This should be addressed at another time.
In the course of the US Civil War, each side had defeats. There were a number of important defeats for the Confederacy. One of the most significant one was the defeat of the South at the Battle of Gettysburg.
That could describe Antietam/Sharpsburg (Sept 62) or Murfreesboro/Stones River (Dec 62).
In both cases, the Confederates could claim to have won, yet they retreated both times.
Fredericksburg
The Union had victory!both sides claimed victory but it was the union who actually won
It was a 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).
Union Victory
Union
The Union had victory!both sides claimed victory but it was the union who actually won
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
First battle in Tennessee - a Union victory under the unknown Brigadier-General U.S. Grant.