In 1940, the world's anti-fascist battlefield entered its most difficult period. On the European battlefield, the Nazi army blitzed Poland and then took over the Netherlands, Belgium, Luxembourg and Norway. On June 14, 1940, France, known as one of the world's powers, surrendered. Hitler reviewed the troops in front of the Arc de Triomphe and clamored to implement "Operation Sea Lion" to attack Britain. The Soviet Union, which has always supported China, had to sign a ceasefire agreement on the Manchuria-Mongolia border with Japan to avoid being attacked from both sides. In China, the Kuomintang army on the front battlefield was defeated. In order to resist the attack of the Japanese army, Lieutenant General Zhang Zizhong (played by Deng Chao) died in the brutal Zaoyi Battle, and the Jianghan Plain and most of Central China fell into the hands of the Japanese. In Yan'an, northern Shaanxi, China, under the frequent bombing of Japanese bombers, Mao Zedong (played by Tang Guoqiang), Zhu De (played by Wang Wufu) and other Chinese Communist Party leaders were worried about the future and destiny of China. They decided that at this time, the Communist Party and the Eighth Route Army and the New Fourth Army led by it should stand up, break the argument of national subjugation and surrender, inject hope into the world anti-fascist battlefield, and strike a heavy blow to the Japanese army that invaded China. At the Eighth Route Army headquarters far behind enemy lines in Shanxi, Deputy Commander Peng Dehuai (played by Tao Zeru) and Deputy Chief of Staff Zuo Quan (played by Liu Zhibing) were also carefully, meticulously and intensively planning and preparing for how to implement the spirit of the Central Committee of the Communist Party of China and break the Japanese army's cage policy...