During the most difficult years of the Anti-Japanese War in 1941, the Japanese invaders and the Kuomintang's forces colluded with each other harassing the Shaanxi-Gansu-Ningxia border area. Because of this, people faced many difficulties. A charcoal burning team of Eighth Route Army in Yan'an responded to the call of the Party Central Committee and Chairman Mao to "do it yourself, get enough food ...