When Chiang Kai-shek arrived at Sian in the fall of 1936 and laid plans for launching his last campaign against the Red Army with an expectation of exterminating it in a month, he badly misjudged the mood of the Tungpei (Northeast) Army and more so its leader, Chang Hsueh-liang, better known as the Young Marshal. Refusing to fight the Communists, Chang with the loyal support of his officers sta…