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It happened in pennsylvania. the union won the battle because they knew the terrain better. It was a important turning point in the the war

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The Battle of Fort Donelson happen in Tennessee,Kentucky was fought for 5 days, in February 11, of 1862. It was a Union victory. they won because Nathan Bedford Forrest focused on the black troops this battle was important because it paved the way for the Union to capture Nashville.

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Sep 19, 1863 it was a confederate victory.  there are 34,000 casualties. the union did not play to their
advantages

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September 17 1862. A winner was not declared for the battle of Antietam.  It happened in Maryland But the union manage to push back the invading confederate army this paved the way  for the Emancipation Proclamation.

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July 21, 1861 it was a confederate victory. It took place at Virginia . The union soldiers were routed by the confederate soldiers. It was demoralizing to the union soldiers but moved the confederate soldiers to think they could win.