Every battle fought by the Army of Northern Virginia was against the Union army.
Probably most of the states were represented there. It was the Army of Northern Virginia (Confederate) under Lee against the Army of the Potomac (Union) under the newly-promoted Meade. It was a Union victory.
Delaware, Kentucky, Maryland, and Missouri were four slave states that did not secede from the Union. West Virginia, another slave state, seceded from Virginia and joined the Union during the Civil War. it was 4 that didn't secede from the union.
The union fought against slavery in the civil war
cilvl war2
The Confederacy and the Union
The Korean war was fought against North Koreans and Russian servicemen.
C.S.S. Virginia
The First Battle of Bull Run was at Manassas, Virginia.
The Union Army of the Potomac, and the Confederate Army of Northern Virginia.
It was fought in and around Fredericksburg Virginia. General Robert E. Lee's Confederate Army of Northern Virginia and the Union Army of the Potomac, commanded by Maj. Gen.Ambrose Burnside.
The Rebels were the South. They fought against the North, i.e. the Union army.