从1940年开始,在晋察冀抗日根据地冀东区党分委的统一领导下,冀东的党政军民经过一年多的艰苦奋斗,创建出一个具有相当规模的冀东抗日游击根据地。据1941年1月统计:有主力部队4090人,游击小组500人,秘密武装300人,自卫军8400人,党员6918人;有抗日组织工作的村庄2500个,根据地人口发展到150万人。根据地已经向南威胁北宁铁路和日军视为“重要国防资源所 Starting from 1940, under the unified leadership of the party committee of Jidong District in the anti-Japanese base area of ​​Jinchaji, Jidong’s party, government, and military personnel, after more than a year of hard work, created a large-scale base for guerrilla warfare in Jidong. According to the January 1941 statistics, there are 4,090 main forces, 500 guerrilla groups, 300 secret armed forces, 8,400 self-defense troops and 6,918 party members. There are also 2,500 villages with anti-Japanese organizations and the population has grown to 1.5 million. The base areas have threatened the south with the Beining Railway and the Japanese troops as ”major defense resources."