Merrill's Marauders, 1962. Directed by Samuel Fuller and stars Jeff Chandler.
https://upload.wikimedia.org/wikiped...rmaraudpos.jpg
The film was shot in the Philippines and is a rather good account.
Chandler injured his back while making film, and filmed most of film under painkilling injections. you can see him wincing, and when he returned to USA had an op, but alas died under anesthetic..