The turning point was not a battle but a siege, the Siege of Vicksburg.
Most historians and scholars believe the turning point of the American Civil War was the Battle of Gettysburg fought in July 1863.
Some historians considered it the turning point, previously, but, majority opinion now considers Vicksburg to be the actual turning point.
The actual turning point was the fall of Vicksburg at around the same time.
Vicksburg
The Battle of Gettysburg.
Gettysburg
Vicksburg
The true turning point of the Civil War was the seizure of Vicksburg, but it was really the result of a siege.
being the turning point of the civil war.
Gettysburg
The Battle of Gettysburg