During the Spring and Autumn Period, when Jin, one of the five tyrants, attacked a small country, he ordered the army to take only three days' rations. If they can't attack in three days, the army will retreat. The original country clung to the city and resisted stubbornly. Three days later, failed to capture the country of origin. Jin Wengong ordered the retreat, and the commander asked: According to the information, the original country will not last long, and then withdraw after the original country surrendered. Jin Wengong said: "Credit is the foundation of the country and the will of the people. It is not worth the loss to lose faith in the people in order to get the original. " The Jin army retreated 30 Li according to Jin Wengong's orders. When the original country heard the news, the Lord surrendered to the state of Jin.