 Medical facilities were enlarged and reorganized based on improved hospitals and the creation of modern nursing, typified by Florence Nightingale in Britain during the Crimean War of 1854-56.Naval warfare was transformed by many innovations, most notably the coal-based steam engine, highly accurate long-range naval guns, heavy steel armour for battleships, mines, and the introduction of the torpedo, followed by the torpedo boat and the destroyer.Coal after 1900 was eventually displaced by more efficient oil, but meanwhile navies with an international scope had to depend on a network of coaling stations to refuel.