#cannon  a large artillery gun that is usually on wheels
  supertype:  artillery__heavy_weapon__heavyweapon__gun__ordnance  large but transportable armament
  subtype:  basilisk.cannon  ancient brass cannon
  subtype:  harpoon_gun__harpoongun  a cannon or cannon-like gun that fires harpoons
  subtype:  high-angle_gun  a cannon that can be fired at a high elevation for relatively short ranges
     subtype:  trench_mortar__mortar__howitzer  a muzzle-loading high-angle gun with a short barrel that fires shells at high elevations for a short range
  subtype:  long_tom  a long swivel cannon formerly used by the navy

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