 The Copperheads had told Hines to wait until that time, as they said that 50,000 Copperheads would be there for the event.However, encountering Copperhead hesitation to assist Hines and his force, and with Federal authorities apparently knowledgeable of the plot, Hines and his men were forced to flee Chicago on August 30, 1864.Many of the men thought Anderson may have been a double agent, forcing him to leave the group.