I would do what Pancho Villa's head executioner, Fierro, did. Fierro used to let captured federales get a running start from their cells to get over a wall to freedom. Fierro would have a six gun in both hands with a helper reloading his revolvers. Nobody made it over the wall.
These guys would be given a chance to get over a wall before they got shot. If they made it over the wall, they were free on parole. I don't think they'd make it over the wall if I was in charge.
