 Dateline, Gettysburg, Pennsylvania. July 1st, 1863, the first day of the Battle of Gettysburg. Little crossroads town, south central Pennsylvania. Started as an engagement between units of the American, the Army of the Northern Virginia under Confederates Robert E. Lee. And advancing northward into the Union Territory for the second time, first time was Antietam. And the Army of the Potomac under Major General George Meade.