In The Dillinger Days, historian John Toland writes that prisoners in solitary confinement in the Indiana State Penitentiary played a version of Battleship during the 1920s, marking squares on their cell floors and calling out attacks from cell to cell. "For years the more obtuse guards wondered what was being plotted when they heard men calling: 'B-7.' 'Miss.' 'C-8.' 'Destroyer sunk!'" (John Toland, The Dillinger Days, p. 24. Da Capo Press 1995)