jul 3, 1863 - Battle of Gettsburg

Description:

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.
Link: http://www.history.com/topics/american-civil-war/battle-of-gettysburg