Superguns, including: Obusier De 520 Modèle 1916, Krupp K5, Railway Gun, Bl 13.5 Inch Mk V Naval Gun, Type 90 240 Mm Railway Gun, Bl 12 Inch Railway ... Gun, Bl 14 Inch Railway Gun, 21 Cm K 12 (e)

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More info: A supergun is an extraordinarily large cannon with an extremely high muzzle velocity and large bore. They are used to bombard an enemy from extremely long range and destroy heavy fortifications.