War was between Union and Confederacy. Union won the war.
Explanation:
The Union and Confederacy fought between 1852 and 1865 including the battle of Antietam. General Robert E. Lee leads the forces of the southern side and General George B. McClellan led the forces of the northern side.
General Lee tried to defeat the union which was headed by General George McClellan but finally, the war was won by Union. Both sides suffered badly in this war. This was an important event in America's history.
