北平地下党组织1931年9月18日,日本帝国主义侵占了中国东北。由于蒋介石的“攘外必先安内”的反动政策,更加助长了日本帝国主义的侵略气焰,日军又疯狂地向华北进行新的侵略扩张。1933年1月攻陷山海关,继而向热河、察哈尔和冀东进犯,威胁平津。5月,国民党政府又与日本侵略者签订了丧权辱国的《塘沽协定》,把热河、察东、冀东大片国土拱手送给了侵略者。平津及全国各地民众纷纷要求国民党政府出兵抗日。 Peking underground party September 18, 1931, Japanese imperialism invaded northeast China. Because of Chiang Kai-shek’s reactionary policy of “peace and security must be settled first within China,” the Japanese imperialists even encouraged the aggressive rhetoric, and the Japanese troops frantically engaged in a new aggressive expansion to North China. January 1933 Shanhaiguan captured, followed by Jehol, Chahar and Jidong, threatening Binjin. In May, the Kuomintang government signed a Tanggu Agreement with the Japanese invaders to sacrifice and dishonor the country and handed over vast territory of Jehol, Chadong and Jidong to the aggressor. People in all parts of the country and Pingjin asked the Kuomintang government to send troops to resist Japan.