What were the battles of Civil War?

During the American Civil War, several battles turned out to be most 'key' (or, decisive) in terms of the overall outcome. The most important of these occurred in 1863: first, at Vicksburg (Mississippi), where Union troops eventually took control of this bastion of the river and thereby cut the South into two parts; second, at Gettysburg (Pennsylvania), where the second invasion-attempt by the South was stymied, with the Southern army retreating back to Virginia, never again to attempt an invasion of the North.