High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! HMS Invincible was an Audacious-class ironclad battleship of the Royal Navy. She was built at the Napier shipyard and completed in 1870. Completed just 10 years after Warrior, she still carried sails as well as a steam engine. The Audacious-class was armed with ten 9 in (230 mm) muzzle-loading guns, supported by four 6 in (0.15 m) muzzle loaders. These were located in a broadside pattern over a 59 ft (18 m) two-deck central battery amidships - this was the area of the ship least affected by its motion, and made them very stable gun platforms.

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