When Cao Wei, the general of the Song Dynasty, heard of the mutiny, he was not frightened. Instead, he improvised, talked and laughed, and did not pursue, making the enemy mistakenly think that the defectors were sent by Cao Wei to attack and killed them all. How Cao Wei freely used the knife and knife hidden in his smile to kill people! The ancient art of war has long reminded fighters: never believe each other's sweet words and empty promises, and beware of their hidden dangers. In short, this plan is mostly used in the guise of military politics and diplomacy.

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Hide the knife in the smile, originally refers to the practice of "calling your brother in your mouth and touching the guy in your hand". Militarily, this plan is to deceive and paralyze each other with political and diplomatic camouflage to cover up their military actions. This is a seemingly friendly strategy, but in fact it hides mystery.

Story 1

During the Warring States period, in order to expand to the outside world, the State of Qin had to seize the mountainous area of the Yellow River, where the terrain was dangerous, and sent Gongsun Yang as the general to attack the State of Wei. Gong Sunyang's army arrived in Wucheng, Wei. This Wucheng used to be the place where Wu Qi, a famous Wei, worked hard. The terrain is dangerous and the fortifications are strong, so it is difficult to attack directly. GongSunYang puzzling over the siege. When he learned that Wei Shoujiang was his son, he was overjoyed. He immediately wrote a letter and took the initiative to befriend his son, saying that although we are both masters, considering our previous friendship, it is better for the two countries to call a truce and make peace. Homesickness is beyond words. He also suggested making appointments for talks and major events. After the letter was sent, GongSunYang voluntarily withdrew and ordered the striker to retreat immediately. Childe line read the letter, see Qin Jun withdrawing troops, very happy, immediately reply agreed on the date of the negotiations. See GongSunYang childe line has got into the trap, secretly set an ambush in the venue. On the day of the meeting, Gongzi Xing took 300 followers to the appointed place. Seeing that GongSunYang's entourage was few and unarmed, he believed each other's sincerity even more. The atmosphere of the talks was very harmonious, and the two men rekindled their old feelings and expressed their sincerity in making good friends. Sun An also held a banquet for his son. He hasn't been seated, childe Xing Hang rushed to the crowd. Suddenly, he heard a call and an ambush came from all directions. Childe Xing Hang and his 300 followers didn't respond, and they were all captured. Gongsunyang used his captured followers to trick Wu Cheng into opening the city gate and occupying Wu Cheng. Wei had to cede the Xihe area and make peace with Qin. Qin used GongSunYang's smile to hide the sword.

Story 2

There is a dagger hidden behind the smile ―― there is an intention to kill behind the smile.

During the Three Kingdoms period, Jingzhou became a battleground for military strategists because of its very important geographical position. In 2 17, Lu Su died of illness. Sun and Cao's honeymoon is over. At that time, Guan Yu was guarding Jingzhou, and Sun Quan had long wanted to seize Jingzhou, but the time was not yet ripe. Soon after, Guan Yu sent troops to attack Fancheng controlled by Cao Cao, fearing future troubles, leaving heavy troops stationed in public security and Nanjun to defend Jingzhou. Monroe, a general under Sun Quan, thought it was time to capture Jingzhou, but because of illness, he suggested that Sun Quan send Lu Xun, a young general who was unknown at that time, to take his place and be stationed in Lukou.

Lu Xun was not obvious when he took office, so he decided to make up with Guan Yu and really prepare for the war. He wrote a letter to Guan Yu, boasting about Guan Yu, saying that Guan Yu was as successful as Jin Wengong and Han Xin. I call myself a scholar. I'm too young to take on heavy responsibilities. I want Guan Yu to give me more advice. Guan Yu is a proud and conceited man. He is very arrogant. After reading Lu Xun's letter, he smiled and said to heaven, "I don't care about Jiangdong." Immediately, most of the troops were transferred from the defenders who defended Jingzhou and attacked Fancheng wholeheartedly. Lu Xun secretly sent someone to tip off Cao Cao and agreed that both sides would jointly attack Guan Yu.

Sun Quan thought that the time was ripe to seize Jingzhou and sent Monroe as a pioneer to Jingzhou. Lv Meng ambushed elite force on a warship converted into a merchant ship, and traveled day and night, suddenly attacking and occupying the south. Guan Yu got the news and hurried back to the division, but it was too late. Sun Quan's army has occupied Jingzhou. Guan Yu had to fail in Maicheng.