The main characters in the tunnel warfare of Wing are Zhang Senlin, Gao Laozhong and Zhao Pingyuan. The three men have the spirit of perseverance, perseverance and courage to struggle, the innovative spirit of wit, flexibility, courage to challenge and be the first in the world, the unity spirit of cadres and the masses, the concerted efforts of Qi Xin to overcome difficulties together, and the selfless dedication, willingness to contribute and selfless dedication.

Zhang Senlin tactfully and decisively commanded two patriotic young students in Baoding to escape safely, and he and Huang Yue stayed behind to stop the enemy. After a long gun battle, the bullets were almost used up, and Huang Yue was seriously injured. After asking for instructions, Zhang Senlin, secretary of the district party committee, drank bullets and sacrificed himself. Gao Laozhuang, secretary of the Party branch, and Gao Chuanbao, captain of the militia, led the villagers and responded in time, transforming earth caves and cellars into several tunnels. Under the education of Captain Zhao, Gao Chuanbao suddenly woke up and led the guerrillas to quietly transform the cellar into a tunnel under the cover of night, forming an underground Great Wall that could attack the enemy in a hidden way. Gao Chuanbao led the team members to launch tactics such as sparrow warfare, assault warfare and firecracker warfare at Heifengkou to defeat the enemy.