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 carpetbaggers 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