The Battle of Antietam was the first battle on northern land and was a tragic day in the Civil War. They say more Americans was killed on September 17,1862 than on any other day in military history.
On January 1,1863 president Abraham Lincoln signed an executive order (Emancipation Proclamation) which declared freedom of the slaves in the confederate states but not everyone was happy about it the south disagreed.
After the Union army won they later went to northern Virginia into Pennsylvania. The confederates fought the unions army during the Gettysburg Battle.