On July 7, 1937, Japan launched a full-scale war against China. As the Chinese army retreated, an intelligence team became trapped in an area controlled by the Japanese forces. One of the cipher officers on this team possessed the highest-level password of the Nationalist Army. Should it fall into the hands of the Japanese, the consequences would be unimaginable.
The highest commander of the Nationalist Army's combat zone ordered the C Company of the Nationalist Army and the D Company of the New Fourth Army, which were closest to the intelligence team, to rush immediately to their aid.
Thus, these two companies, formerly bitter enemies belonging respectively to the Nationalists and the Communists, began arduous battles behind enemy lines. In the course of fighting together against the powerful and brutal Japanese army, the two company commanders transformed from foes into brothers, and C Company and D Company also became known as the Chinese Brotherhood of Brothers.
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