The original title is "La guerre du feu" (The war of fire). The film is enjoyable and generally faithful to the book of Rosny l'aîné.
"La guerre du feu" was written more than a century ago, and the author was more interested in romance and adventure (and selling books) than in scientific accuracy. The film removes or softens the colonialist and dated perspective (tribes of inferior humans, fully domesticating mammoth, fighting for a woman...) and portrays the cooperation between tribes.
Available in: https://archive.org/details/QuestforFire.1981.720p.BluRay.X2...