IAs to how Angel Eyes joined up with the Union Army ... one of the recently restored scenes shows him at a ruined Confederate fort, where he learns that the man he's after, if he's alive, is likely to be a prisoner of war at a notorious Union prison camp. He then steals a uniform and identification from a dead Union sergeant and impersonates him in the camp (this last detail isn't in the film, but it is to be found in the novelization of the screenplay and was presumably in the original script).