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"Big Guns" (Part 2) traces naval technology from the ironclads of the Civil War to the dreadnought-class battleships, whose heyday was in World War I. The first innovation: the USS Monitor's gun turret. In England, meanwhile, John Reed designs HMS Devastation, a mastless seagoing vessel, in 1871. "The modern battleship was beginning to emerge," says narrator Stacy Keach. The turbine engine came along some 25 years later, making big battleships possible.