回复：It was the reason that KMD thought they could defeat GCD

Right. As a joke or maybe not, did Chang Jung (author of Mao's Untold Story) research and determined that Chiang Kai-shek is a red agent for GCD. If Wu Chun-nan was a red agent because his 200,000 troops could not defeat Mao's 20,000 poorly equipped army in Northern Shansi. A resonable mind would lead to the conclusion that Chiang's irrational behavior such as disregarding the sound military advice from his top generals like Tu Rui-ming.