Raiders of the South (1947)

Johnny Brownell, former Confederate officer turned Federal agent, is sent to Texas during the reconstruction years to obtain evidence against a gang of raiders who have been making life difficult for the local carpet-baggers. He saves the life of Shorty Kendall, an unreconstructed rebel about to be hanged, and this wins him the gratitude of Belle Chambers, a widow whose husband was killed in the Civil War who hates all Yankees with a fever.