Answer:
In his letter to his wife, written before his execution, John Brown, the abolitionist, stated that his intention in attacking the federal armory at Harpers Ferry was to start a slave rebellion that would end slavery in the United States.
In the letter, Brown wrote that he hoped his actions would "call attention to the wickedness and injustice of slavery" and "awaken the conscience of the American people." He believed that by seizing the armory and distributing weapons to slaves, he could spark a rebellion that would spread throughout the South and lead to the overthrow of the slave system.
Brown also acknowledged that his actions were risky and that he was prepared to die for his cause. He wrote, "I am now quite certain that the crimes of this guilty land will never be purged away but with blood. I had, as I now think, vainly flattered myself that without very much bloodshed it might be done."
Overall, Brown saw his attack on Harpers Ferry as a necessary and justifiable means of ending slavery and believed that his actions would inspire others to join his cause and bring about the end of slavery in the United States.