In the autumn of 1938, deep in the Yimeng Mountains in a small mountain village called Mama Chi, Mother Yu and her husband Li Zhonghou were busy with the wedding of their second son Jicheng. Looking at the happy young couple, Mother Yu's eldest daughter-in-law "Elder Sister" couldn't help but think about the night of her own wedding when her husband Jiuzhang fled. The village loafer Niao Er came to tell everyone that soldiers were coming. Panic-stricken villagers hid in the gullies. After the soldiers left, they returned to find that not only had the village not been plundered, but the streets had also been cleaned. Some families even found money left as compensation. It turned out that the soldiers were Eighth Route Army who entered the Yimeng Mountains to fight against the Japanese.