German shipping lines were aggressive competitors for the custom of transatlantic passengers in the early 20th century, and Cunard responded by trying to outdo them in speed, capacity, and luxury. Cunard used assistance from the British Admiralty to build "Lusitania", on the understanding that the ship would be available as a light merchant cruiser in time of war. She had gun mounts for deck cannons, but no guns were ever installed. Both "Lusitania" and "Mauretania" were fitted with turbine engines that enabled them to maintain a service speed of . They were equipped with lifts, wireless telegraph, and electric light, and provided 50 percent more passenger space than any other ship; the first-class decks were known for their sumptuous furnishings.