Preston was a source of reason and reconciliation between white settlers and the hostile Sioux tribe in the Dakota territory.
Colonel Preston found himself in a difficult command in the Dakota Territory keeping the peace between white settlers and the Sioux led by the legendary Chief Sitting Bull. Knowing that the Sioux had superior numbers, Preston was committed to a strategy of negotiation and bargaining to keep the peace. During this time, Preston hosted a reporter from back East named Fay Kirby and gave her a frank and honest testimony of the situation.
An alleged killing of a miner and a revenge killing of a Sioux man by other miners threatened the precarious peace that Preston had worked out. He turned to a tall scout named Cheyenne Bodie to visit Sitting Bull and bring peace to the situation.