 The fleet was impressive, especially as a demonstration of American industrial prowess (all eighteen ships had been constructed since the Spanish–American War), but already the battleships represented the suddenly outdated 'pre-dreadnought' type of capital ship, as the first battleships of the revolutionary had just entered service, and the U.S. Navy's first dreadnought, , was already fitting out.The two oldest ships in the fleet, and , were already obsolete and unfit for battle; two others, and , had to be detached at San Francisco because of mechanical troubles and were replaced by the and the .