Introduction & nbsp; The Jiaozhuanghu Underground Station Site is located at the foot of Waituo Mountain, a branch of the Yanshan Mountains, in the northeast of Shunyi District, Beijing. It is 60 kilometers away from Dongzhimen and 30 kilometers away from Shunyi City. It is a natural village and belongs to Longwantun Town, Shunyi District. It is located at the throat leading to Pingxi and Pingbei, and has been a battleground for military strategists since ancient times. The "July 7th Incident" led to the full-scale invasion of China by Japanese imperialism. The Japanese aggressors established a puppet regime in the occupied areas and frequently deployed Japanese puppet troops to Jiaozhuanghu Village to capture soldiers and seize food, committing all kinds of evil deeds and arousing the local people's hatred towards the invading Japanese army. In the autumn of 1938, the party organization came to Jiaozhuanghu Village and led all the farmers in the village to launch an arduous armed struggle against the Japanese invaders. During the war, the people of Jiaozhuanghu continuously summarized their struggle experience in order to strike the enemy and protect themselves. In the spring of 1943, they began digging underground tunnels and continuously renovated and expanded them in actual combat. By 1945, they had formed a 23 mile long underground Great Wall connecting villages and households. In the subsequent wars, the people of Jiaozhuanghu dealt heavy blows to the enemy and effectively protected themselves, setting a glorious example for the anti Japanese war of the people in eastern Hebei. Due to its innovative forms of struggle and outstanding achievements, in November 1947, the Shunyi County People's Government awarded Jiaozhuanghu the glorious title of "People's First Fortress". Now, the Jiaozhuanghu Tunnel Warfare Site is a key cultural relic protection unit in Beijing. In 1996, the country designated the Jiaozhuanghu Tunnel Warfare Site Memorial Hall as one of the national patriotic education bases for primary and secondary schools