Antietam: this battle was taken place on September 17, 1862. The Union general McClellan did not know where the Confederates were, but found a copy of Lee’s strategy near the abandoned camp. The Confederate army led by Lee and the Union army led by McClellan met at Antietam Creek, MD. The Union won, and the defeated Confederates retreated back into Virginia. It is significant because it was the bloodiest day of the Civil war, and Lincoln was able to issue the Emancipation Proclamation.