Fu Zuoyi
In November 1936 Demchugdongrub presented Fu Zuoyi with an ultimatum to surrender. When Fu responded that Demchugdongrub was merely a puppet of "certain quarters" and requested that he submit to the authority of the Chiang Kai-shek's central government, Prince De's Mongolian and Manchurian armies launched another, more ambitious attack. This time Demchugdongrub's 15,000 soldiers were armed with Japanese weapons, supported by Japanese aircraft, and often led by Japanese officers. (Japanese soldiers fighting for Mengguguo were often executed by Chinese forces after their capture as illegal combatants, since Mengjiang was not recognized as being part of Japan).