(A) Battle of Gettysburg
(B) ** Battle of Vicksburg
(C) Battle of Antietam
(D) Battle of Bull Run
EXPLANATIONS BELOW
Concept note-1: -The Battle of Vicksburg was a decisive Union victory during the American Civil War that divided the Confederacy and cemented the reputation of Union General Ulysses S. Grant.
Concept note-2: -With the loss of Confederate general John C. Pemberton’s army after the siege at Vicksburg and a Union victory at Port Hudson five days later, the Union controlled the entire Mississippi River and the Confederacy was split in half.