Both sides believed that they would soon win the war was the impact of public opinion of Battle of Manassas.
Bull Run was the Civil War's first major battle. Because of the fierce fighting there, both the North and South were forced to face the sobering reality that the war would be long and bloody.
The Union suffered 3,000 casualties in the First Battle of Bull Run (called First Manassas in the South), while the Confederates suffered 1,750. Its outcome shook northerners who had expected a quick, decisive victory and gave jubilant southerners false hope that they, too, could pull off a quick victory.
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