The Tall Stranger (1957) on Netflix

Back from the Civil War, an ex-Yankee officer aids a wagon train of former Confederates settle in a prosperous valley marred by cattle-rustling and land-grabbing feuds.

Ned Bannon comes across rustlers and is shot and left for dead, but is found in time by a wagon train heading for California. When he recovers he becomes suspicious of the two outsiders who are leading the train into a dead-end valley owned by his hostile half-brother. Braving his relative's animosity going back to the Civil War, Bannon makes contact to try and avoid a showdown.

—Jeremy Perkins {J-26}