If you were disappointed by the lack of subtlety in “Batman,” prepare yourself for Marion Davies' performance in this rather amusingly formulaic Civil War story. "Gail" is brought on board by Mr. Pinkerton himself to work as a spy for the Union, infiltrating Confederate territory. She darkens her skin, dons a laundry maid’s outfit, and adopts an accent intended to help her blend in as a servant girl. Fortunately for …