The menace of the hostile division led to an arms race, another cause of World War I. Acknowledging that Germany was the leader in military organization and efficiency, the great powers of Europe copied the universal conscription, large reserves and detailed planning of the Prussian system. Technological and organizational developments led to the formation of general staffs with precise plans for mobilization and attack that often could not be reversed once they were begun. The German von Schlieffen Plan to attack France before Russia in the event of war with Russia was one such complicated plan that drew more countries into war than necessary. Armies and navies were greatly expanded. The standing armies of France and Germany doubled in size between 1870 and 1914. Naval expansion was also extremely competitive, particularly between Germany and Great Britain. By 1889, the British had established the principle that in order to maintain naval superiority in the event of war they would have to have a navy two and a half times as large as the second-largest navy. This motivated the British to launch the Dreadnought, invented by Admiral Sir John Fisher, in 1906. The Russo-Japanese War of 1904-1905 had demonstrated how effective these battleships were. As Britain increased their output of battleships, Germany correspondingly stepped up their naval production, including the Dreadnought. Although efforts for worldwide disarmament were made at the Hague Conferences of 1899 and 1907, international rivalry caused the arms race to continue to feed on itself.
