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  Casualties total 26,000; Lee's invasion of North ends in retreat
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  eventually frees all slaves
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  Turning point in was- Union armydefeats the Congederate army
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  after 40 days of nonstop cannon assultrs from Union troops
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  by President Lincoln at the dedication of a national cemetary on the site of the battlefield in Gettysburg
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  Sherman's troops burn the city to the ground
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