1937年卢沟桥事变开启了全民族抗战的序幕。当年的7月28日,故都北平沦陷。日军占领者为侵吞全中国,加强了北平方面军队、警察、宪兵、特务各种机构,伪市政府成为统治全市的中枢。北平市伪警察局在城内设立了若干分局,负责管理市政警务;还先后组建了7个警察队(每队编制相当于大队),全副武装,配有汽车,机动性能好,分驻内城和外城。潜伏在警察第7队中的共产党员、进步分子和拥护民族解放的基本群众,为争取武装,迎 The Marco Polo Bridge incident in 1937 opened the prelude to the nationwide war of resistance. July 28 that year, so the capital of Peking fall. Japanese occupiers embezzled all of China, strengthened the Peiping army, police, gendarmes, agents various agencies, the pseudo-municipal government became the ruler of the city’s central. Beiping City, pseudo-police station in the city set up a number of sub-stations responsible for the management of municipal police; also has set up seven police teams (each team is equivalent to the brigade), fully armed, equipped with cars, good mobility, sub-station in the inner city And the outer city. Communists lurking in Team 7 of the police, progressive elements, and basic people who support national liberation are fighting for arms