What was the battle of bull run?

The battle of bull run was the first major battle in the armies of Virginia. This battle was also known as Manassas. This battle was on July 21,1861. The battle was between 35,000 union troops and 20,000 confederate troops. The confederate won which gave the south more confidence , when the union lost the north side was surprised. There was also a second battle of bull run. In august 28-30, 1862. And the confederates won again
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What caused the battle of bull run?

The issue on slavery because they had different beliefs on the topic of slavery. Also on the issue of the how the government was run. Since the union felt that they did not have enough representation in the House of Representatives.