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To the union, what did their defeat at the first battle of bull run on july 21, 1861, indicate about the civil war

User Khris
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The defeat at the Battle of Bull Run indicated to the union that the civil war was not going to be an easy "90 day war" like they initially thought it would be. The union realized that they had a real, serious war in front of them and they needed to prepare accordingly. 
User Dsingleton
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