In the fifth year of Lu Yin Gong (BC718), the affairs of the Jin Kingdom began to be seen in the Spring and Autumn Period. In the spring of that year, with the help of Zheng and Xing and the royal army, Quwo Zhuangbo captured the capital and drove away the Jin and Hubei Hou. But in the autumn, Qu Wobo betrayed the royal family, and Father Yu was ordered to drive Qu Wo's army out of the capital. After the Yu army helped the Jin people to set up another Jin monarch, they retreated. Regarding this history, the author will narrate it later when writing the history of the Jin Kingdom.

In the spring of this year, Zheng Zhuanggong decided to take revenge on Weiguo. The crown prince suddenly persuaded: "The culprit who planned to attack Zheng is Zhou Hu, since he has been ambushed, does my father first observe the new monarch's attitude towards our country before making a decision?" ”

Zheng Zhuanggong turned his head to Gongzi Tu and asked, "Tu, what do you think?" ”

Gongzi Tu said: "Wei Huan attacked Zheng, and the state called for the killing of the monarch to usurp the throne and then cut down Zheng, which shows that the iteration of Wei Guo's monarchy is only an internal matter of the public office, and has nothing to do with our country." Although the state calls for death, the hatred between the two countries will not necessarily be eliminated because of this. Although Zheng Guo is small, he should not look at the faces of other countries to formulate foreign policies. Therefore, the minister believed that no matter who the successor was, he should be guarded. ”

Zheng Zhuanggong asked the prince again: "Su, what other opinions do you have?" ”

The crown prince suddenly said: "Everything is the only one who looks forward to the father's horse." But even if it is best to delay the division for two months, because Wei Hou Xinli, in order to win the support of the government and the opposition, he will inevitably rebury Wei Huan. If the defenders hold a funeral, we will have to withdraw our troops, and it will be useless to work and not be good for the country and the people. ”

Zheng Zhuanggong said: "Then defeat the enemy before the patriots are reburied." Three days later, the army was sent out, and it was decided. ”

As a result, as soon as Zheng Jun marched to the Qingyi ferry on the south bank of the Yellow River, he received the news that Wei Ren had changed his burial to Duke Huan. Zheng Zhuanggong had to stop, he said: "My sons really have their own strengths! How perfect it would be to concentrate all your strengths on one person! ”

During the Spring and Autumn Period, the Chinese princes all observed a war salute, that is, no matter how deep the hatred between the two countries was, a country could not attack while the enemy country was suffering from natural disasters, man-made disasters, or great mourning.

Zheng's army was stationed in Qingyi and waited until the funeral of Duke Wei Huan before continuing north. Zheng's army crossed the Yellow River and marched towards Modu, where they were finally stationed on the outskirts of the capital to await the enemy. But the defenders only symbolically sent an infantry to fight the attackers, and then retreated back into the city and refused to fight. Zheng Jun also had no intention of attacking the city, so he plundered nearby and returned to the division.

After Zheng Guo withdrew his troops, Wei Xuangong couldn't swallow this evil breath, so he immediately contacted Nanyan to crusade against Zheng Guo. The former site of Nanyan is near Yanjin, Henan Province, which is an ancient small country with the surname Yao, and there is a marriage relationship between Nanyan and Weiguo.

Before the fall of Yu and Yi, Zheng Guo protected Nanyan from the oppression of the two countries; After the fall of Yu and Yi, Zheng Guo replaced the two countries and began to squeeze Nanyan. Nan Yanbo always wanted to find a new backer, and later married Wei Guo.

Nan Yanbo couldn't help but be overjoyed when he received Wei Xuangong's letter, and he immediately ordered a bloody ceremony with the envoy of Wei Guo. However, some wise doctors advised him: "Yan is not too big, not as strong as Yi, and is adjacent to Zheng; And Weiguo is far away in Hebei. The reason why Yan has not perished today is entirely because of the result of serving Zheng Guo wholeheartedly. If you promise to defend the country, Yan Guo will go out today, and it will perish on a cloudy day, and Wei Guo will not have time to rescue and have no ability to rescue our country. Therefore, the king should refuse the request of the guard. ”

Nan Yanbo shook his stubborn head and said, "Yu, there is no way, so it was destroyed." Today, Uncle Zheng has no way, and the few have the way, how can there be no way to destroy the way? Besides, do the widows only have the country to rely on? Zheng Guo is the enemy of the royal family, Song, Lu, Chen, and Cai, and has become the finger of Wanfu, and it will soon perish. Does the widow want to hold Uncle Zheng's thigh and sink into the abyss together? ”

Although the doctors argued with reason and said dry mouths, Nan Yanbo was still unmoved. The two people then held a ceremony, and Nan Yanbo soon led a large army to Zheng as agreed.

The guards also set out as scheduled, but due to the heavy rain for several days, the roads were muddy and difficult to navigate, and the guards had to stop to wait for the weather to improve, and the result was a delay of a few days. When the Southern Yan Army arrived at the designated place but did not see the friendly troops, they couldn't help but feel uneasy.

The doctors suggested divination of the good fortune and evil of the battle, but Yan Bo said: "Since the widow has decided to go to war, there is no need to do divination. Because divination is only to solve doubts, why do you still have to do divination if you don't have doubts? ”

The doctors also suggested retreating before the arrival of Zheng's army, and Yan Bo said: "If we have not seen any trace of the enemy, we will flee, so when the enemy attacks the city, will we also abandon the country and flee?" ”

So the Yan army set up camp and built a fence to the east of the barracks, and dug a wide trench outside the barracks.

Zheng's army arrived at the battlefield two days later. Zheng Zhuanggong decided to defeat the enemy while the Yan army was isolated. Gong Zheng Zhuang ordered Saizu, Yuan Fan, and Qi Jia to lead the three armies to face the Yan division, and ordered his two sons, Gongziyi and Gongzi, to sneak into the system quietly, and led the local armed forces to lie in ambush behind the Yan division.

According to the regulations of the Zhou rites, Zheng Guo's national function of such a title was to establish the second army (you must know that the Jin State did not establish the second army until more than half a century later, and the third army was only established in the year of the Battle of Chengpu), and the number of Zheng Guo's army has reached the establishment of the prince and marquis level countries.

There were only two armies in the Southern Yan Kingdom, and the soldiers feared the imposing and outnumbered Zheng army, so they had to rely on favorable terrain and fortified walls to defend while waiting for the arrival of friendly forces.

In the early morning of the next day, Zheng's army began to launch a full-front attack on the enemy's camp. The archers used arrows to suppress resistance in the enemy camp, and the soldiers threw sandbags into the trenches, which soon filled in several flat paths. Zheng's offensive was quite violent, and as a result, all the enemy's forces were attracted to the front.

The two princes led the surprise soldiers of the city to raid the enemy's rear camp. The rear camp of the Southern Yan army was almost empty, and there was no trench to protect it. The army entered the enemy camp almost in square steps. The two sons marched all the way, and soon saw the Yan army in a hurry.

The Yan army suddenly found that there were formed enemy troops behind them, and immediately bombed the battalion. The two princes immediately ordered an attack, and the army of the city let go of their hands and feet to slash and kill the enemy. Seeing that the enemy camp was in chaos, he shouted: "The sons have succeeded!" Rush in and drive the Yan people out of Zheng Guo! ”

The Zheng army finally destroyed the barrier of the enemy camp and rushed into the camp. Seeing that they were unable to resist, the commanders of the Yan army had to order to flee from the flank, and the Yan division was then routed. Zheng Zhuanggong was reluctant to do more killing, but only symbolically chased for a moment before ordering the troops to be withdrawn.

This battle ended with the complete defeat of the Yan army, and the Yan people were killed and wounded and captured countless times, and all the baggage was reduced to the spoils of the Zheng people.

The Wei army encountered the remnants of the defeated army on the subsequent march, and Wei Xuangong suddenly lost all his courage; He did not dare to move on, so he had to stop and turn his horse's head and go home.

However, Wei Xuangong believed that this was his first expedition after taking the throne, and he must not return in vain. At this time, someone around him told him that the state of Yu (near present-day Yuncheng, Shandong) had taken advantage of the fire to rob when there was a turmoil in the country (the killing of Zhou Hu), and it was better to take the opportunity to punish the state of Yun.

Wei Xuangong then launched a surprise attack on the unsuspecting Yu State. The guards captured the country of Yu, and forced the marquis to sign an alliance in the city, which saved a little face.