Fighting in the north of Sangqian at night, the Qin soldiers did not return. - "Stuffed Song"
When it comes to the affairs of the Warring States, the complexity is not something that can be clearly explained in three words, and the disputes are very chaotic. Generally speaking, it is a mixture of interests, and there are always you and me in this matter, implicated in each other, and there are too many grudges and grudges. According to some simple historical records, during the Warring States period alone, there were thousands of wars, and to use the current terms, it is described as being in the "rain of guns and bullets" every day.
With the development of events, from the Spring and Autumn Period to the Warring States period, the scale of the war was getting bigger and bigger, and the number of participating countries was getting smaller and smaller, but the consumption of each war was getting bigger and bigger. In the end, it was the Qin state that unified the six kingdoms, which made the world gain some peace. In fact, if you think about it in that era, the great cause of the unification of the six kingdoms of the Qin State was not something that could be done in a word.

Later, the State of Qin was constantly obstructed by the Six Kingdoms. Because the six countries are not as close as we think, there are also conflicts of interest between them, and each country has its own selfish intentions, so the forces hindering the Qin state are not particularly strong. In the Spring and Autumn Period and the Warring States Period, the biggest turning point was not the Battle of Changping, but the War of the Five Kingdoms. This war is very funny, simply put, the five countries originally joined forces to attack the Qin state, but who knows in the blink of an eye, it was the five countries that jointly attacked the state of Qi, and came by surprise. After this, the world has also changed dramatically.
The real turning point - Wu Guo Fa Qi
The five B.C. countries agreed to attack the State of Qin together, and after the outbreak of war, the State of Qi did not join other countries, but turned to attack the State of Song. In 286 AD, the State of Qi, together with Wei and Chu, went to attack the State of Song for the third time. Later, the Song State was defeated, and the five kingdoms divided the land of the Song State equally, and the State of Qi of course still accounted for the largest proportion, and after this battle, the strength of the State of Qi was greatly improved.
The fall of the Song dynasty was very noisy, and every princely royal family felt very afraid, but the expansion of the State of Qi did not stop. Speaking of the State of Qi and the State of Yan, the contradictions between the two countries are very deep, and the State of Qi once wanted to annex the State of Yan, but it was stopped by the countries at that time. Although the State of Yan has not been annexed, the national strength of the State of Yan is still very weak in comparison.
In fact, the idea of the Five Kingdoms cutting down Qin was proposed by the State of Qin, because the State of Qin had always wanted to unite with other countries to weaken the power of the State of Qi. Because the State of Yan and the State of Qi have a very great hatred, this good opportunity the State of Yan will definitely seize.
These five combined countries showed no mercy at all in attacking the State of Qi, so the whole process of attacking the State of Qi was very smooth. The State of Qi suffered heavy losses because of this incident, and its strength was greatly weakened both in terms of land and population, and after this incident, the State of Qi never had the opportunity to compete with the State of Qin.
Zonghengjia - Su Qin
In this war, why was the small Yan country able to break through with the cooperation of other countries? At this time, I had to mention one person, and this person was Su Qin. Su Qin was a Native of Luoyang, and was also a very famous Zongheng family in ancient times, and was a great strategist. Later, Qin Shi Huang burned books and burned many books about Su Qin, so sima Qian made many mistakes when compiling historical records.
It was not until 1973 that archaeologists found a book called "Warring States Zhonghengjia Book" in a Han tomb, which made it possible to understand what kind of person Su Qin really was. Only after understanding it did I know that the key to this war was Su Qin, and it was because of Su Qin's plan that the State of Qi was greatly defeated.
Su Qin, a disciple of Ghost Guzi, had a different experience from others, and in the early years he constantly traveled around the world to tell His thoughts to King Zhou Xianwang and King Hui of Qin. But because his scholarship was not yet refined and he was not reused, he could only return home with his head down. When he got home, everyone looked down on him very much, because he was a poor student with no money, and some people laughed at him behind his back.
Because he was looked down upon by everyone, he decided to work hard. After that, he began to stab the head overhang beam cone and eventually learned something. He saw that the situation at that time was that the Qin state was not only powerful, but also occupied a place that could be attacked and retreated, so he decided to unite with the six countries to resist the Qin state. In the end, he actually said that he had moved the monarchs of the six countries, formed an alliance of the six countries, and he was wearing the seal of the six kingdoms, which could be described as a monstrous power at that time.
At that time, because of this situation, the State of Qin also had to be cautious and stopped expanding to the east. In fact. Su Qin's organization of the Six Kingdoms to cut down Qin did not mean that he hated the Qin State very much. Before the Six Kingdoms cut down Qin, he had united with the Five Kingdoms to cut Qin, but the Qi state of the allies finally betrayed everyone, so the movement ended in failure. Later, Su Qin could not stay in the Zhao Kingdom any longer, so he defected to the Yan Kingdom.
The two things that made Su Qin almost die
Su Qin helped King Yi of Yan capture dozens of cities in the State of Qi in the State of Yan, and was credited with great merit. But what no one expected was that it didn't take long for him to get two big things. The first was that he was framed by the ministers of the Yan State, saying that he had betrayed the country and wanted to rebel. But this was a non-existent thing, and he escaped a disaster by relying on his mouth that could speak.
But then something happened that made him suffer a great test, that is, someone reported that he had actually had an affair with the emperor's mother, and this matter was also known to King Yan Yi. In history, people who had adultery with the empress dowager generally did not have a good ending, and Su Qin was also very afraid at that time, but king Yan Yi's approach was very surprising, not only did he not put Su Qin to death, but he rewarded him with a big prize and promoted him to an official position.
But The real purpose of King Yan Yi was actually to look after Su Qin's connections and use his wisdom to resist invasions by other countries. It was precisely because of King Yanyi's forgiveness that Su Qin had always been grateful and said that he would be loyal to the Yan kingdom. Later, the State of Qi grew stronger and stronger, and King Yi of Yan was afraid that his country would be threatened, at which time Su Qin volunteered to go to the State of Qi to prepare for the later attack of the State of Qi by the State of Yan, and this was ten years.
epilogue:
History is always full of drama, and all directions have their own laws. Speaking of the Spring and Autumn Period and the Warring States Period, everyone not only thinks of constant wars, but also a major event is the controversy of a hundred schools of thought. On one hand it is an era of war, and on the other it is an era of ideas.
In that era, it was actually very free, and the mind was uncontrolled, think of Confucius at that time, who traveled around the world to propagate his ideas. As long as you have the ability, everyone will not care which country you are, like Su Qin, it is because of your talent that you have allowed yourself to escape the disaster. That era of war and strife was also an era of bursts of talent, and these people and events together constituted the special background of that era.
References: "History", "Warring States Policy"