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Development of War Plan Amber

War Plan Yellow

War Plan Yellow was intended to enforce parts of the Boxer Protocol of 1901 by keeping sea lines of communication to Peking (Beijing) open and ensuring the safety of American citizens endangered by armed groups, including forces in opposition to the central Chinese government or the Chinese government itself. According to Pardoe (2014) there were two variations of the plan. Variation A was a limited operation conducted primarily by the U.S. Navy and Marine Corps, with only limited U.S. Army reinforcement from the Philippines and Hawaii. It aimed at securing seaports for a short period of time to evacuate American citizens, after which it would withdraw. Variation B on the other hand called for a more involved restoration of order. It would involve the deployment of forces to Peking, Chinwangtao, Shanghai, and Taku to take control of the country's centers of commerce and most developed transportation infrastructure. Early drafts of Variation B called for 5 infantry divisions. Although this was formally reduced to 2 divisions in 1929, it was expected to take more troops. Just guarding the Peiping-Tientsin-Taku-Chiwangtao railway would require 3 divisions, plus a division for seaports.

One key challenge envisioned as part of Yellow Variation B was lacking transportation infrastructure in China—particularly few roads that could support motor vehicles. If enacted, American forces would likely be limited to beasts of burden, walking, and riverine transport provided by the U.S. Navy for movement across the country. The potential requirement of patrolling rivers, destroying coastal fortifications, protecting captured seaports, evacuating American citizens, and transporting ground forces would have likely outpaced the U.S. Navy's resources at the time, though.