Chahar Province
After the Japanese Imperial Force occupied Manchuria following the Mukden Incident in 1931, it attempted to follow up with an invasion into northern China. Between June and July 1935, the Chin-Doihara Agreement was negotiated between Japan and the Chinese Kuomintang (KMT) government as a way for the former to gain control of Chahar Province. A puppet state known as "Eastern Hebei Anti-Communist Autonomous Government" was then set up by a Yin Rugeng with Japanese help. In response to the demands by Japan to create a separate regime in Northern China, the KMT government was forced to establish the "Hebei-Chahar Political Council". The Chinese Communists, on the other hand, called for a voluntary mobilization of all Chinese people to resist Japanese aggression in a proclamation published on August 1, 1935.