With their emancipation guaranteed by the Union victory in the American civil war, groups of former slaves are encouraged by the state to head west and develop and cultivate the land. Ex-bluecoat "Buck" (Sidney Poitier) sets himself up as a wagon-master for these would-be emigrants. For a modest fee, he agrees to show them the way and guarantee their safety. Now there are those who don't much like this relocation plan, and the "DeShay" gang are employed by the southern cotton farmers to try to ensure that their erstwhile property never survive the trip. It's one such altercation that sees "Buc...