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History See other History Articles Title: War Plan Orange War Plan Orange (commonly known as Plan Orange or just Orange) refers to a series of United States Joint Army and Navy Board war plans for dealing with a possible war with Japan during the interwar years. The plans were begun informally in 1919 and formally adopted by the Joint Army and Navy Board beginning in 1924.[1] Predating the Rainbow plans, which presumed the assistance of allies, Orange was predicated on the U.S. fighting Japan alone. It anticipated a withholding of supplies from the Philippines and other U.S. outposts in the Western Pacific (they were expected to hold out on their own), while the Pacific Fleet marshaled its strength at bases in California, and guarded against attacks on the Panama Canal. After mobilization (the ships maintained only half of their crews in peacetime), the fleet would sail to the Western Pacific to relieve American forces in Guam and the Philippines. Afterwards, the fleet would sail due north for a decisive battle against the Imperial Japanese Navy, and then blockade the Japanese home islands. The Imperial Japanese Navy developed a counter-plan to allow the Pacific Fleet to sail across the Pacific while using submarines and carrier attacks to weaken it. The Japanese fleet would then attempt to force a battle against the U.S. in a "decisive battle area", near Japan, after inflicting such attrition. This is in keeping with the theory of Alfred Thayer Mahan, a doctrine to which every major navy subscribed before World War II, in which wars would be decided by engagements between opposing surface fleets[2] (as they had been for over 300 years). It was the basis for Japan's demand for a 70% ratio (10:10:7) at the Washington Naval Conference, which would give Japan superiority in the "decisive battle area", and the U.S.'s insistence on a 60% ratio, as 70% superiority was believed to be necessary for a successful attack.[1] The American war planners failed to appreciate that technological advances in submarines and naval aviation had made Mahan's doctrine obsolete. In particular, the American planners did not understand that aircraft could sink battleships, nor that Japan might put the U.S. battleship force (the Battle Line) out of action at a stroke--as it did at Pearl Harbor. American plans changed after this attack. Even after major Japanese defeats like Midway, the U.S. fleet favored a methodical "island-hopping" advance, never going far beyond land-based air cover.[3] Moreover, by their obsession with "decisive battle", the Imperial Japanese Navy would ignore the vital role of anti-submarine warfare.[4] Germany and the U.S. would demonstrate the need for this with their submarine campaigns against Allied and Japanese merchant shipping respectively. The American campaign ultimately choked Japan's industrial production. Japan also notably failed to institute an anti-commerce campaign themselves. Popular Culture In 2005, Justin Prince Designs created a computer wargame simulating a hypothetical war between the United States and Japan in the 1920s titled War Plan Orange: Dreadnoughts in the Pacific, 1922-1930.[5] The game includes eight scenarios with different initial setup positions for the combatants; one scenario permits players to use the planned "super-dreadnoughts" for which construction had been aborted after keels had been laid due to the terms of the Washington Naval Treaty. Great Naval Battles 3 included two scenarios for Plan Orange. Both placed the battles between Formosa and the Philippines, the second involving early war carriers on both sides.
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