The Indians are supposed to be Seminoles, a tribe native to Florida.
However, the Indians shown in the film are wearing the headdresses and clothing of various tribes--i.e., Sioux, Kiowa, Blackfoot--of the Southwest, which is nowhere near Florida.
Although the narrator says the setting is 1855, the soldiers are wearing uniforms and carrying weapons that were not in use until long after the US Civil War of 1861-65.