Grey Knight

During the Civil War, a Union soldier is recruited to investigate a series of crucifixions by a renegade band of Confederate Soldiers. He enlists the help of his old mentor and a mute runaway slave girl, the only witness to the renegade band's attacks. With the addition of some trigger happy Yankees, the brigade is complete. They soon realize, however, they are not hunting ordinary Confederates. The men have fallen victim to an African curse; they cannot die, despite all the Union's firepower. The Union brigade eventually becomes the hunted, and soon is surrounded by the haunted ghost brigade without any means to defend themselves. Their fate seems certain when they realize the Confederates can't tolerate silver or cross any bodies of water.