84 years ago today, June 3, 1941 (lunar calendar May 9, 1941), the people of Jizhong launched underground warfare and mine warfare against the army. Burying mines on highways In June 1941, as the struggle against "encroachment" became increasingly acute and cruel, the people in the first district of Li County, Hebei Province, summed up their experience in the practice of struggle and gradually transformed isolated hidden holes into tunnels. The Party Committee of the Central Hebei District promptly promoted the people's initiative of transforming the plain terrain in the struggle against the enemy, and continued to improve it in the struggle. In many places, a complete combat tunnel system has been formed that connects houses, connects villages and villages, makes it easy to enter and exit, and can hide, defend, fight and maneuver. Tunnel warfare, combined with mine warfare and other forms of struggle, has become an effective way to persist in plain warfare. In June, the Jizhong District Committee of the Communist Party of China held an organizational work meeting to summarize the experience of the struggle against "nibble" and study strategies for the struggle against Japan. During the conference, a landmine exhibition was held to introduce the experience of the Seventh Military Division in carrying out explosion campaigns. Later, it was widely promoted in various base areas. The military and civilians worked together to create explosives and mines on their own, forming a mass explosion movement. Later, it was commonly known as landmine warfare. This method became one of the important methods to eliminate the Japanese army. The militiamen fought against the enemy entering the village at the junction