 In December 1936, Chiang Kai-shek flew to the Nationalist headquarters in Xi'an in order to test the loyalty of local KMT military forces under Marshal Zhang Xueliang, and to personally lead these forces in a final attack on Communist bases in Shaanxi, which Zhang had been ordered to destroy.Determined to force Chiang to direct China's forces against the Japanese (who had taken Zhang's territory of Manchuria and were preparing a broader invasion), on 12 December Zhang and his followers stormed Chiang's headquarters, killed most of his bodyguards, and seized the Generalissimo in what became known as the Xi'an Incident.Reactions to Chiang's kidnapping in Yan'an were mixed.