It was found in the house of a Seneca Native American. It may also depict something of the Abenaki? She didn't know what it depicted but it belonged to her grandmother so probably 100 years old? My suspicion is something to do with Sitting Bull's exodus into Canada or return to the US? Thanks much.
The style of the uniform on the man in the foreground suggests that the painting depicts an event that took place in the late 18th century to early 19th century, which rules out that it has anything to do with Sitting Bull.