A.Samuels-Civil War By s0303084 Period: Jan 1, 1860 to Dec 31, 1870 Civil War Dec 15, 1860 South Carolina seceeds from Union. Sep 17, 1862 Battle of Antietam This Union victory was important.But for the Confederacy.......they lost their chance for Britian to be a ally.The Civil War's bloodiest day. Jan 1, 1863 Emancipation Proclamation Freed all slaves in the Confederate states fighting in the war.