Conversation so far:
What happened at Harpers Ferry?
John Brown's raid on Harpers Ferry was an 1859 effort by abolitionist John Brown to initiate an armed slave revolt at Harpers Ferry, Virginia.
Who was John Brown?
Tubman was introduced to the abolitionist John Brown, an insurgent who advocated the use of violence to destroy slavery in the United States.
Was John Brown part of the raid on Harpers Ferry?
On May 8, 1858, Brown held a meeting in Chatham, Ontario, where he unveiled his plan for a raid on Harpers Ferry, Virginia.

Question: What happened during the attack?
Self-contained rewrite: What happened during the attack on Harpers Ferry?