Lautaro (1978)

The Mapuche tribe asks their Gods for help in difficult situations, including illness and drought. When the Spanish conquerers on their horses invade their country, the indigenous people think that they are aliens. The Spaniards capture and enslave many of the Mapuche tribe. Lautaro, a young captured native, realizes that these aliens are human beings without any divine power. He learns to use their weapons and organizes a resistance movement against the intruders.

Unfortunately the movie Lautaro is not yet available on HBO Max.