Zhang Hengli

A small town defends itself from the Japanese by use of a network of tunnels during the Second Sino-Japanese War.

An underground CPC telegrapher, Li Xia, fights against the Japanese enemy and dies before the eve of Shanghai's liberation in 1939.

1943, the Japanese Army is falling back to the Pacific, leaving only collaborationist troops. Commissar Yang Xiaodong is sent to inflitrate the provincial capital.