7th Cavalry is a 1956 American Western film starring Randolph Scott. It was directed by Joseph H. Lewis.
The story follows Captain Benson, a cavalry officer who returns after being held captive following the Battle of Little Bighorn. He faces suspicion from fellow soldiers and sets out to prove his courage and loyalty.
If you meant a different movie about the U.S. Seventh Cavalry, tell me any actor, year, or scene you remember, and I can help identify it.