Dakota 38 is a documentary that follows the annual horse ride that honors the memory of the Dakota men and boys executed after the US-Dakota War of 1862. The 330-mile ride starts early to mid-December in Lower Brule, South Dakota, and ends in Mankato, Minnesota on December 26th.
The film, by Smooth Feather Productions, is free to watch. It shares the story of the ride and people. http://www.smoothfeather.com/dakota38