The epic drama Dances with Wolves 1990 is set during the US Civil War. The movie opens with a battle scene between the North and the South. John Dunbar does not want to live as a cripple and is worn of war. He tried to end his life but ends up giving the Union an accidental victory.
Confederate Flags in Dances with Wolves
The South flying the Confederate Battle Flag which is the square saltire. Behind it is the official flag of the Confederacy which at this time had 'three' thick stripes - red, white, and red with a 'Betsy Ross' canton of several stars.
Note the Confederate Officer has a feather in his cap. Perhaps he has some Native American heritage?