What caused John Brown to be arrested?

Answer:
John Brown raided the town of Herper's Ferry, Virginia with 20 other men on October 16, 1859. His plan was to capture the national armor in the town and start a massive slave uprising in the south, but this never happened. A group of 100 US marines led by general Robert E. Lee stormed the building the next day and killed or captured all his men. He was hanged on December 2, 1859.
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