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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.
It would determine whether General Lee's invasion of the North would be successful. He also wanted to gather supplies from the North, and hoped a major victory in Union territory would make the Union lose the will to fight.