Hostiles (film)

Hostiles is a 2017 American Western film written and directed by Scott Cooper, based on a story by Donald E. Stewart. It stars Christian Bale, Rosamund Pike, Wes Studi, Ben Foster, Stephen Lang, Jesse Plemons, Rory Cochrane, Adam Beach, Q'orianka Kilcher, and Timothée Chalamet. It follows a U.S. Army cavalry officer who must escort a Cheyenne war chief and his family back to their home in Montana in 1892.

Question: is hostiles the movie based on a true story
Answer: no