"Zuo Chuan Xi Gong twenty-three years" : Tsao said: "If by the spirit of the King, you get against Jin, Jin, Chu rule soldiers, in the case of Central Plain, its Pijun Sanshe. If not ordered, his left to hold the whip, the right is a capsule, to deal with you. " Chong Er fled to Chu, king Cheng of Chu received him as a vassal. At the feast, prince of Chu asked, "if you return to Jin and become king of the state of Jin, what will you give me in return? " Chong' Er answered, "you have all the beautiful women and silk, and all the kings of Chu. I don't know what I can do to repay you. " Even so, the King of Chu said, "you must do something in return. " "thanks to Your Majesty, if I return to Jin and succeed to the throne, if I have to fight, if I meet you in Central Plain, I will retreat and deal with you, " said 636 BC Duke Wen of Jin, who returned as King of the Jin Dynasty and was known as Duke Wen of Jin. Later, in the battle of defeating Cao and battling with Chu to conquer the city of Pu, Wen Gong really kept his promise and issued an army order to let the Jin army retreat. The Jin army systematically retreated three times (30 miles each) , and the Chu Army pressed on three times. The Chu Army did not know that the Jin army was using the tactics of conniving, conceding and luring the enemy deep.