In 597 BC, Chu Zhuangwang sent troops to besiege Zheng for 17 days, but Zheng failed to make peace and was in danger of national subjugation. The soldiers guarding the city burst into tears and wailed loudly. The last straw, retreat from the city to let Zheng Junmin catch his breath and repair the city wall. Then attack the city on a large scale. After the city was broken, he led the army from the imperial city into Zheng's capital. Zheng Xianggong bareshouldered and led the sheep to meet Chu Zhuangwang on the road. He knelt on the ground and complained to the king of Chu, expressing his willingness to accept the arbitrary disposal and arrangement of Chu and "obey orders." Finally, I hope Chu Zhuangwang can remember the good friendship between Zheng and Chu, protect Zheng, and make A Zheng a vassal of Chu. The minister of Chu refused to accept the plea, and suggested that Chu Zhuangwang destroy Zheng once and for all, saying that "the country is unforgivable". However, if we can treat people with courtesy, we can trust Zheng and win the support of all the people. How can it expect to destroy Zheng? Accepted the request, led the army to retreat three miles, signed a peace treaty with Zheng, and Zheng Guocai was saved. It should be pointed out that Chu did not destroy Zheng, although it was the result of the strategy of "guiding sheep shirtless, dressing people with clothes" and adopting "a big country must take a big country under a small country", but it was also related to Zheng Dangshi's status. Zheng is located in the Central Plains, sandwiched between Jin and Chu, and is the buffer state of Jin and Chu. If we insist on destroying Zheng, it will intensify the contradiction between Chu and Jin, and make Jin directly engage in war with Chu, which is extremely unfavorable to Chu. What's more, the monarch of Zheng "can be a servant" and trusts his people. Even if Zheng is destroyed, the soldiers and civilians of Zheng will inevitably resist, leading to the war in Chu. Weighing the pros and cons and resolutely giving up the move to destroy Zheng is his wise performance. However, Zheng Xianggong's "shirtless sheep" attitude eased the contradiction between Zheng and Chu with courtesy, which satisfied the vain and arrogant experience of the king of Chu to a certain extent, which was also an important condition for the success of the negotiations between Zheng and Chu. If you are incompetent, ignorant, arrogant, corrupt and eccentric, you are doomed to perish. No mourning will help. For example, in 1275 and 10, Bo Yan, commander-in-chief of the Yuan Army, divided his troops and attacked Lin 'an, the capital of the Southern Song Dynasty (Hangzhou, Zhejiang). Bo Yan was born in Changzhou on February 4th, 65438. Song Ting sent Liu Yue, an army supervisor, to Wuxi for peace. Bo Yan's army is in the western suburbs of Wuxi, and will summon all the generals and Song envoys. Take out the credentials and letters of the Song Dynasty ministers, Lu and others, bow down to the ground, and cry bitterly:

Now, the empress dowager is old, the heir is weak, and the first emperor is in decline? NFDA9？ Medium. Since ancient times, the ceremony has not cut the funeral, and I hope that the Prime Minister will forgive the class, so that the three palaces will not be uneasy and the Mausoleum will be shaken. Dare to repair it every year? Water under the bridge, treacherous court official Jia Sidao broke his word and made a mistake. (Yuan Shi (volume 127) Biography of Bo Yan)

Liu Yue hoped to intercede through "weeping bitterly", saying "annual service and annual repair", so as to achieve the purpose of withdrawing the Yuan army and preserving the residual water in the Southern Song Dynasty. However, Bo Yan knew the reality of the Southern Song Dynasty like the back of his hand and made up his mind to destroy it. He was unmoved by Liu Yue's humble words, and said with an expression: "At the beginning of his ascent, I sent a letter to make peace. Your rogue held me hostage for 16 years, and I was guilty. Whose fault is it to carry and kill Lian for no reason? If he wants our teacher not to be promoted, will he work for Qian Wang Naxi? Is Li Wang out? Ersong once won the world in the hands of children, and now he has lost in the hands of children. Needless to say "(History of Yuan Dynasty 127, Biography of Bo Yan).

Bo Yan rebuked the crimes of arrest, murder and breach of contract in the Southern Song Dynasty, and reiterated the justice of the Crusaders. Require the Southern Song Dynasty imperial court to enforce the law. "

When Qian Wang went to the south, he gave up his troops only after issuing a letter of surrender. After Bo Yan sent Liu Yue away, he went straight to Lin 'an and destroyed the Southern Song Dynasty. It can be seen that "sorrowful soldiers will win" and "doing good" must be backed by certain strength. Laozi's words of "mourning for soldiers" and "building a big country from a small country" are a winning skill of combining rigidity with softness, not just kowtowing.

Because Zheng was sandwiched between Jin Chu and near Jin, Chu attacked, served Chu and attacked Jin. In order to survive in the hegemony of powerful countries, Zheng Jun and his subjects had to use many military and diplomatic strategies, such as making small things big, restraining arrogance with modesty, and forcing softness. In 630 BC, the state of Jin joined the state of Qin, and the army besieged the capital of Zheng, so the disaster of Zheng's demise was imminent. Zheng Wengong first apologized to the doctor and admitted that he couldn't reuse him too early. At the critical moment, asking him for advice is generally alienated and urgent. The monarch condescended to apologize to his courtiers and was extremely humble. Wu was sent to the critically ill by candlelight. When he saw him at night, he said to him:

Qin Jin surrounded Zheng, who knew he was dead. If Zheng's death is good for you, dare to disturb the deacon. Yue is far away, and you know its difficulty. How to use the dead Zheng to accompany the neighbors? Neighbors are thick, gentlemen are thin. If Zheng is the host, you can travel with your luggage and let him kill time. And your taste was given by Jin Jun. Xu Jun was in a hurry and had defects, and he made a version in the evening, as you know. Fujin, why bother? It is both a seal for Zheng Yudong and a seal for the West. I took it if I didn't miss Qin. If you miss Qin, it will be good for Jin, and only if you figure it out!

Qin Bo said that it is also right to form an alliance with Zheng to be a miscellaneous son, meet his grandson and expose his grandson. ("Zuo Zhuan Xi Gong Thirty Years")

Qin and Jin were the overlords in the Spring and Autumn Period. It is obvious to all that if the two countries jointly attack Zheng, Zheng will die. Candle Wu confessed that "Qin Jin surrounded Zheng and Zheng knew his death." His words were both sad and sour. However, the Wu of Candle didn't woo, but used the contradiction between Qin Jin to point out that "destroying Zheng" was beneficial to the State of Jin and unfavorable to the State of Qin. "Candlewick Arms" stood in the position of Qin State, analyzed the situation, and advised Qin State to give up the plot to destroy Zheng. He said humbly, "If you give up Zheng as the master, the luggage will be used as the master." In this way, moved, not only gave up Zheng, but also sent troops to Zheng to resist 8 Jin Army, which enabled Zheng to survive the crisis. Candlelight is humble, soft and hard, hides the needle in the middle, turns the enemy into a friend, saves the day, and makes immortal contributions to protecting the country and defending the country.