A British colonel arrives at the fort and announces that he needs to use some of the cavalrymen for a secret mission that has been approved by the U.S. government---to root out an Irish revolutionary who is planning to sell weapons to the Sioux as part of a scheme to blackmail the U.S. into supporting his cause. Custer and the redcoat form an instant dislike for each other, but still Custer volunteers for the mission.
—rbecker28