The fall of Fangyi marked the temporary end of Zheng Zhuanggong's action of "begging for the court with the king's order". But the war is not over, it has just begun.

Although Song Yangong's mind was spinning very slowly, it was still spinning after all. He finally stopped stubbornly insisting on frontal combat, but by this time Gaocheng had already been lost. He instead sent an envoy to Wei Guo, asking Wei Xuangong to send troops to invade Zheng with the Song division.

Wei Xuangong felt very embarrassed, because Wei Guo and Zheng Guo had just formed an alliance of tile houses. The Song envoy said: "Although Wei Guo and Zheng Guo have an alliance, the two countries have never been allies - just look at Zheng Guo's despicable tactics against another ally of the Wawu Alliance (Song State)." Wei Guo's failure to participate in the war against the Song coalition army was already disobeying the king's order, and it was already the best excuse for Zheng Guo to attack Wei Guo, and Zheng Guo's next target would definitely be Wei Guo.

"Instead of asking Song Guo to help him at a critical moment, it is better to take the initiative to attack Zheng Guo with the widow now! Zheng Shi was still stationed in Fangyi and did not embark on the road back to China. Zheng Guo is empty in the country, if we can capture Xinzheng or eliminate Zheng Liaosheng's army, we will no longer have to worry about the security of our country! You must know that in the current situation when the Son of Heaven is losing power, it is impossible for any country to remain neutral! So please ask Wei Hou to make a wise choice! ”

The Patriots finally decided to side with the Song State. Wei Xuangong believed that the strength of the two countries alone was still not enough to fight Zheng Guo, so he dragged Cai Guoren onto a leaky thief ship.

Song and Wei each gathered an army to attack Xinzheng. However, the army encountered heavy rain on the march, and the pace of advance became very slow. By the time the coalition forces reached the outskirts of Xinzheng, the Zheng people were ready for defense. The coalition originally wanted to carry out a sneak attack, so the number of people was not enough to attack the city, and they lacked baggage and siege weapons, so they prepared to return home after sweeping the perimeter.

The Song people found that the road they came from had been washed away by the flood, and the army had to choose another shortcut to withdraw.

Zheng Zhuanggong received an urgent report of the military situation and immediately led his army back to China, and when Zheng entered the country from the north, the coalition army was about to leave from the east. On the shortcut to the return of the allied army, there was a small country called Dai Guo (now east of Minquan County). Dai Guo and Song Guo have the same surname, located between the two great powers of Zheng and Song, and are a typical country that strives to survive in the cracks.

Dai Guo was attached to Zheng Guo at this time, and there were three reasons for his affiliation: first, because the two countries had an in-law relationship; second, because Zheng Zhuanggong likes to use the method of bribery to make friends with small countries; The third is because Song Yangong's character is too inferior.

Song Yangong sent an envoy to Dai to prepare to borrow from the host to return to China. But no one inside and outside Dai Guogong, the monarch and the ministers, agreed to borrow the way, and it turned out that Song Yangong was so stingy that he was reluctant to spend a little benefit to buy the spokesperson.

Since the request to borrow the road was denied, the coalition forces should take a detour and get out of danger as soon as possible. But Song Yangong was carried away by the anger, he forgot that he was still in the enemy territory, and resolutely gave the order to attack the city.

Kong Fujia advised: "The purpose of our army's invasion of Zheng State is to relieve the siege of Gao and Fang, and now that the Zheng army has returned to the division, the purpose has been achieved, and we should quickly return to China to prepare for the war against Zheng State." Dai Guo is not guilty, and attacking Dai Guo is tantamount to making an extraneous branch. If it is attacked by Dai and Zheng inside, our army will definitely be defeated. ”

Song Yangong said: "Then hurry up and occupy Dai before the arrival of the Zheng army." ”

Although Dai Guo is small, it is built in a dangerous place, it is at the pass of an east-west pass, Dai Guo faces Zheng Guo side is a five-mile wide pass, facing the Song State side is like a bell mouth from narrow to wide flat area.

Dai Guo was built on the north side of the pass, and two fortresses were built side by side on the south side, and the fortresses were connected by city bridges, so that a zigzag defense system of "one city and two fortresses" was formed. After inspecting the situation on the ground, Song decided to attack from the east and west, but the strength of the coalition forces was not sufficient.

At this time, Song Yangong made another unreasonable decision, and he ordered the envoy to recruit Cai Guoren to fight Dai together. For Cai Guoren, this is a laborious and unrewarding chore. Marquis Cai Huan felt that Song Yangong was too domineering, and in a fit of rage, he only sent a small army to participate in the battle, and the army was led by a middle doctor.

After Cai's army arrived at the designated place at the western end of the pass, the commanders of the three kingdoms held a meeting together. Because the status of the military commander sent by Cai Hou was too low, Song Yangong thought that he looked down on him, so he said a lot of cool things from the side, and his words made the commander of Cai Jun extremely annoyed.

A section of the Guards and Cai's army were sent to the east side of Dai. After two days of rapid marching, the coalition army bypassed the pass from the north and finally came to the east gate of Dai. During the march, the guards were in front and the Cai army was behind. The Cai army spotted the traces of the Zheng army as they marched (a large number of Zheng troops followed them from a distance), and the guards could not see the enemy because they were walking in front. However, the Cai people, because they were war-weary and resentful of the Song Dynasty, did not alert the guards and did not report to the Song people.

Zheng Zhuanggong decided to fight a large-scale siege battle. He summoned the crown prince from the capital and asked him to bring all the soldiers who were guarding the city (so that Xinzheng would become an undefended city, and even a gang of 200 rogue bandits would be able to occupy the capital).

Zheng Zhuang divided the army into two parts: one was led by Gongzi Tu and Gao Qumi, and followed Cai's army to the east side of Dai Guo; The other part, led by the crown prince Ku and Zhu Dan, blocked the western end of the pass and garrisoned the commanding heights in the pass to prevent the enemy from escaping.

Finding themselves in a very dangerous situation, the coalition forces decided to seize the time to capture Dai. When Song Yangong was mobilizing before the war, he shouted: "We have no way out!" If Dai Guo can't be destroyed within three days, let's all go to Zheng Guo as slaves! If we take Dai, not only will we be able to return home safely, but everyone will receive rewards, slaves, and booty—and the entire property of Dai will be yours! Although the sergeants did not believe a word of his words, they had no choice but to occupy Dai.

The coalition forces decided to focus their offensive on two fortresses on the southern flank. The fortress was built on a cliff, and Kong Fujia selected some archers who were good at climbing and ordered them to climb to the top of the cliff. Song Yangong issued a battle order, and the allied forces attacked Dai from the east and west, but the attack on the fortress was all-round.

When the defenders were scattered all over the city to resist, they became a living target for the archers who climbed the cliffs. The archers fired grease-soaked rockets, and the defenders suffered from both the ground and the heights. To make matters worse, the bridge connecting the two fortresses provided excellent cover for the besiegers: the enemy only needed to take simple defensive measures to dig into the wall with confidence. The situation of the fortress became more and more dangerous, and the defenders attacked twice to drive the enemy away from the city bridge, but there were so many enemies that the defenders became the enemy's mouth.

The battle for the assault on the fortress lasted from the early hours of the morning until late evening, and the defenders finally could not resist it after putting up a desperate resistance. The Coalition forces poured into the fortress, and the defenders were forced to lay down their arms, and the Coalition forces were surprised to find that none of the defenders were unharmed.

The battle against Dai did not stop for a moment. It was night, and the battlefield was lit up and people were buzzing. The coalition forces were divided into several groups to attack in turns, and the tired soldiers were withdrawn to rest, and after a few moments they had to continue the battle. The defenders did not have a moment of respite due to their lack of strength, and the occupation of the fortress by the coalition forces also caused great psychological pressure on the Dai people.

Dai Ren pinned his last hope on Zheng Ren, but Zheng Ren turned a blind eye to the attack of the coalition army, and had no intention of rescuing them, as if the death of their allies had nothing to do with them.

The battle lasted all night, and as the sun rose in the east, the coalition forces invaded the kingdom of Dai. Dai Jun did not surrender, but all of his sons were killed in the last resistance, and his last words before death were: "Uncle Zheng mistook me!" ”