Cavalry Capt. James Braydon leaves Union Army Headquarters to visit his sweetheart Elizabeth. Finding her in the arms of a civilian, he returns embittered and volunteers for spy duty. He is detailed to carry false dispatches behind Southern lines where they will mislead the Confederate Army. At a ball given for Confederate officers by Barbara Calhoun, Braydon flirts with the hostess to pique the jealousy of Darrington, who loves her, and to subject himself to arrest, but Barbara defends him even when she discovers him to be a spy, and they fall in love. Ultimately he is forced to leap from a window to assure his capture. The Confederates act on the fraudulent dispatches, though upon discovering his deception, they order him executed. The Union attack comes in time to save him, but he is wounded in the battle. After the surrender at Appomattox Courthouse, Braydon and Barbara are the principals in a military wedding. More on Wikipedia or Mubi
Watch Only the Brave (1930)