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HMS Cornwallis was a Duncan-class pre-dreadnought battleship of the Royal Navy. Built to counter a group of fast Russian battleships, Cornwallis and her sister ships were capable of steaming at 19 knots (35 km/h; 22 mph), making them the fastest battleships in the world. The Duncan-class battleships were armed with a main battery of four 12-inch (305 mm) guns and they were broadly similar to the London-class battleships, though of a slightly reduced displacement and thinner armour layout. As such, they reflected a development of the lighter second-class ships of the Canopus-class battleship. Cornwallis was built between her keel laying in July 1899 and her completion in February 1904.