The plan to take control of the nation's largest armory at Harper's Ferry is finally put into action. However, a crucial mistake by Onion threatens the success of the entire operation. John Brown's army takes hostages, grabbing the attention of an angry mob and local militia. With shots firing, Onion is sent out to get reinforcements.

John Brown and his remaining army take a last stand as more federal troops descend upon Harper's Ferry. With John Brown captured and held for public execution, Onion, truly on his own, risks his life to say his goodbyes to Brown.