**Good: the rise and fall of the spring and autumn of formation and disintegration.
That's right"There are no eternal friends, only eternal interests"。Whether it is goodwill between ** or ** between **, both sides are driven by their own interests. So-called"**Excellent", stemming from the need for the two countries to stabilize their hinterland in the process of foreign expansion. The collapse of the alliance between the two countries was the result of the struggle for territory west of the river.
Due to common interests, the two countries have established friendly relations.
During the spring and mid-to-late autumn periods, the Yin Shang were an important force at that time, but their expansion was still limited. Although the Qin state was still relatively weak among the vassal states at this time, its geographical location threatened the hinterland of the Jin state; The formerly powerful Jin state also exerted tremendous pressure on the Qin state, and the Qin state could not be completely opened to the outside world.
Due to the mutual constraints between the two sides, Qin Mugong took the initiative to show goodwill to the Jin State and proposed to the Jin Xiangong. The Jin State also needed a relatively stable backing, so Jin Xiangong married his daughter Boji to Qin Mugong, and the two countries were linked together through marriage"**Excellent"。
Jin Xiangong broke out in his later years"The Rebellion of Rihime", Duke Yi of Jin took the land west of the river as a reward, and fled back to the Jin State with the support of Duke Mu of Qin to take the throne, but later refused to fulfill his promise. In addition, the Qin state gave the Jin state ** food during the famine, and the Jin state rejected the Qin state's request for assistance during the famine. These two disputes led to the defeat of the Jin Kingdom"Battle of Hanwon"It was not until the prince of Jin was taken hostage by Qin that the two countries were able to rebuild their old friendship.
Qin Mugong married his daughter Huaiyin to Qin Dinggong, but Qin Dinggong learned that his father was seriously ill and fled to the Jin Kingdom. When Qin Mugong learned that his father was seriously ill, he secretly returned to the Jin Kingdom. Qin Mugong was furious, took Gongzhong'er, who had fled to Chu, back to Qin, and remarried his daughter Huaiying to him. The following year, King Huai of Jin ascended the throne, but came into conflict with the Qin state. Annoyed and angry, Qin Mugong helped Chong'er return to the Jin Kingdom, overthrew Jin Dinggong, and sealed Chong'er"Spring and Autumn Five"One of the Jin Wengong. Since then, the two countries have maintained relatively harmonious relations until the reign of Duke Xiang of Jin.
During the alliance between the two countries, although there were disputes during the reign of Jin Hui Gong and Jin Huai Gong, the overall situation was relatively peaceful. Although the two countries did not attack each other, the Jin first conquered Hanoi during the Eastern Zhou Dynasty and then seized large territories from Wei and other vassal states. The Qin state, with the acquiescence of the Jin state, also occupied the Hexi region and conquered many Xirong tribes.
* The alliance collapsed, and the Qin-Chu alliance was born.
* The two countries each occupy half of the country in the Hexi region, and the regional dispute is intensifying. Thus, the alliance between the two countries broke down and broke out"Meal"The battle and"Peng Ya"In the battle, the Jin State defeated the Qin State twice with its strong national strength. This made the Qin state realize that he had to find another powerful ally to fight against the Jin state.
During this period, only the southern state of Chu dared to challenge the supremacy of the Jin state. After the Jin State defeated the Qin State, it confronted the Chu State in the Battle of Dengshui and defeated the Chu State again. This made the state of Chu realize that he had to find an ally to contain the energy of the state of Jin.
As a result, the Qin and Chu states each took what they needed, and the relationship began to become closer. The state of Qin married its daughter to King Cheng of Chu, King Gong of Chu, and King Ping of Chu, which was eventually formed"Qin Chu is good"。After the alliance between Qin and Chu, the southern and western parts of the Jin state were threatened. The powerful Jin state was also unable to cope with the threat from both sides, so it turned to the state of Wu to the east of the state of Chu, and threatened the hinterland of the state of Chu with the support of the state of Wu.
In order to allow the rapid rise of the state of Wu and take the lead in attacking the state of Chu, the Duke of Wu of Jin not only provided chariots, but also sent well-trained masters to teach the formation and skills of the state of Wu to help the state of Wu train soldiers. With the continuous support of the Jin State, the Wu State grew rapidly. With the arrival of Wu Zixu, the state of Wu finally posed a threat to the seemingly powerful state of Chu, thus relieving the pressure on the state of Jin.
Later, the war broke out between Wu and Chu, and Wu won in the battle of Baiju and Qingfa, and after five battles and five victories, he attacked Yingdu, the capital of Chu, and King Zhao of Chu fled in a hurry. Later, with the support of Qin Aigong, the state of Chu successfully defeated the state of Wu and re-established the state of Chu.
After that, the states of Qin and Chu maintained sporadic alliances until the middle of the Warring States period.