UNLESS HE GAVE UP THE PAST, HE COULD NEVER HAVE A FUTURE

An ex-civil war soldier, released for mental instability reports to the Cavalry as his next assignment.
 When the drunken major orders Lieutenant John Dunbar to an abandoned army post,t he war-wear soldier suddenly found himself alone, wondering what had happened to the garrison he was to report to. He found himself beyond the edge of Western civilization, with only a wolf and some roving Comanches for company.

Thievery and survival soon forced Dunbar into the Indian camp, where he began a dangerous adventure that changed his life forever - and earned him his Indian name Dances With Wolves. 
Each day in the wilderness, Dunbar became more Indian to survive, learning the ways of a proud and glorious people. But when his past came back to haunt him and he was faced with the greatest decision of his life, Dunbar discovered where his true loyalties lay ...