During the Anti-Japanese War, Huaibei area was the activity area of the Second Division of the New Fourth Army. The teacher of the Second Division is Luo Binghui, the famous "general's slave" of our army. He should be the prototype of the "big commander".

According to the clue that the New Fourth Army and the Kuomintang Army jointly attacked Huaiyin mentioned in the play, we can know that the Sixth Division of the New Fourth Army, with Chen Dalei as the commander, is active near Huaiyin, and the only generals in the New Fourth Army who can contact with "teachers" and "Huaiyin" are probably Cheng Jun and Chen Qingxian. The prototype of Chen Qingxian can only be linked to the two clues of surname "Chen" and "Sixth".