The Battle of Gettysburg, fought from July 1 to July 3, 1863, is considered the most important engagement of the American Civil War. After a great victory over Union forces at Chancellorsville, General Robert E. Lee marched his Army of Northern Virginia into Pennsylvania in late June 1863. On July 1, the advancing Confederates clashed with the Union’s Army of the Potomac at the crossroads town of Gettysburg. Part of the "Command Decisions" series. Please note this title may contain potentially offensive language and mature themes. Topics in this title pertain to the American Civil War and may contain references, phrases, images, or other notions of a sensitive nature.