Answer:
The Battle of Gettysburg, fought from July 1 to July 3, 1863, is considered the most important engagement of the American Civil War. On July 3, 1863, Union troops repelled a massive artillery assault on Cemetery Ridge during the third day of the Battle of Gettysburg in southern Pennsylvania. ... As a consequence, Confederate General Robert E. Lee was forced to retreat and ultimately abandon his attempt to reach Washington, D.C. via Pennsylvania.
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