Dances with Wolves opens with a brief Civil War prologue in which the protagonist, Lt. John Dunbar (Kevin Costner), establishes himself as a hero by providing a diversion so that a group of Union soldiers can overcome an entrenched Rebel position. Dunbar's reason for his actions - he preferred losing his life to living without a leg (the doctors were planning an amputation) - are unimportant. All that matters are the results, and, because of his bravery, he is offered a station anywhere he wants. He chooses the frontier, so he can see it before it is gone. Soon, he has been dispatched to the small South Dakota post of Fort Sedgewick. But, when he arrives there in the company of the wagon-driver Timmons (Robert Pastorelli), he finds the place deserted. Nevertheless, he resolves to obey his orders, and, after dismissing Timmons, he sets about putting things to right and solving the mystery of where everyone went. For over a month, Dunbar is alone at Fort Sedgewick. His only companions are a friendly wolf that he names Two Socks and his faithful mount, Cisco. The story moves into high gear with the arrival of the Sioux, led by the thoughtful Kicking Bird (Graham Greene) and the tempestuous Wind in His Hair (Rodney A. Grant). At first, there is mutual distrust, but, as Dunbar and the Sioux interact and begin to communicate (each learning a few words of the other's language), they form a truce, then a bond. With every passing day, Dunbar finds himself more and more infatuated with the Sioux way of life. And his interaction with them becomes even easier when Stands With A Fist (Mary McDonnell), a white woman who has lived with the Sioux since childhood, is able to act as an interpreter. Eventually, Dunbar leaves Fort Sedgewick and moves into the Sioux camp. He falls in love with Stands with a Fist, becomes a respected member of the tribe with his own Sioux name ("Dances With Wolves"), and is able to forget the life he left behind - until the day when Fort Sedgewick is garrisoned and the soldiers find him: an out-of-uniform officer "gone Injun.