The "Warrior"-class design used many well-proven technologies that had been used in ocean-going ships for years, including her iron hull, steam engine, and screw propeller; only her wrought-iron armour was a major technological advance. Naval architect and historian David K. Brown wrote, "What made ["Warrior"] truly novel was the way in which these individual aspects were blended together, making her the biggest and most powerful warship in the world." Being faster, better armoured and harder to hit than her rivals, she was superior to any existing naval ship. The Admiralty immediately stopped the construction of all wooden ships of the line, and ordered another eleven ironclads over the next few years. Jacky Fisher, who was the ship's gunnery lieutenant in 1863–1864, later wrote that in spite of this, most people did not realise at the time what a significant change it would bring about: "It certainly was not appreciated that this, our first armourclad ship of war, would cause a fundamental change in what had been in vogue for something like a thousand years."