Naval cannons were set up on gun decks on the typical Man of War and the broadsides resulting from all the guns on one side of a ship firing in unison
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18-pounder long gun - Wikipedia
How were muzzleloading cannons on boats loaded if the cannon's barrel was pointing out of the ship's side? - Quora
English 18th Century Naval Cannon - Irongate Armory
Original Late 18th Century Bronze 2-Pounder Cannon with Oak Naval Carriage – International Military Antiques
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18th Century Mystery: Giant Cannons from British Man o' War Scuttled Off Montauk
English 18th Century Naval Cannon - Irongate Armory