If Heaven wants to destroy it, it must first make it crazy. After becoming emperor, in order to prevent his generals from having too much military power and affecting the imperial power of the Zhao family, the cup of wine released the military power to take back the army of the generals, and although the soldiers did not bloodshedly control the military power in the hands of the emperor, they also laid hidden dangers for the weakness of the Great Song.
On the contrary, since the Liao state obtained the Sixteen Prefectures of Youyun, its strength was further strengthened, and the Song Dynasty was defeated in many collisions with the Liao state. During the reign of Emperor Zhenzong of Song, Song and Liao signed an alliance with Liaoyuan and paid 300,000 coins to the Liao every year. For more than a hundred years after that, the Liao state and the Great Song Coexisted in friendship, and there was almost no major war. Therefore, the Liao state, up to the emperor, down to the nobles, were extremely inflated in their hearts, believing that no country could defeat them, but in September of the fourth year of Liao Tianqing (1114), the chief of the Jurchen Completed Yan Tribe, Guanyan Akuta, gathered 2,500 elite soldiers of the Jurchen tribes, and held the famous Lailiushui Division on the south bank of the Lailiushui River (present-day south bank of the Lalin River in Heilongjiang), and after the oath meeting, took advantage of the fact that the Liao army had not yet assembled, attacked Ningjiang Prefecture east of the Mixed Tong River (present-day Songhua River).

<h1>The Jurchens were an ethnic minority in the ancient northeast of China, and the Jurchens were originally subordinate to the Liao State, but why did Yan Ah Bone swear to destroy the Liao State? </h1>
I think there are several main reasons:
First of all, I think the main reason is that Yan Ah Bone wants to avenge the insult. In February of the second year of Liao Tianqing (1112), Emperor Liao Tianzuo went fishing in the Chaotong River, and the chiefs of the Jurchen tribes came to see Emperor Tianzuo, who knew that Emperor Tianzuo drank too much, and ordered the chiefs to dance one by one to help, but when it was the turn of the chief of the Completed Yan Tribe to finish Yan A Bone, The Finished Yan Ah Bone Beat sternly refused in person, emperor Tianzuo was furious about this, and almost killed him, but the Finished Yan Ah Bone Fight was not jumped, and finally the banquet was not happy. After Ah Kuanda returned to the tribe, he began to actively prepare for war, build walls, manufacture weapons, strengthen military strength, and collect intelligence on the Liao state.
Finish Yan A bone fight
Second, the Liao people often extorted and exploited the Jurchens and demanded a large amount of tribute from them. For example, the emperor of the Liao state often sent emissaries to the Jurchen tribe to ask for the falcon "HaiDongqing", and the Jurchens almost captured all the Haidongqing in the territory to pay tribute to the Liao, but still could not satisfy the emperor's greed. You must know that Hai Dongqing is a good helper for the Jurchens to hunt and survive.
In the end, the Liao ministers who demanded the confession looted and extorted the Jurchens, raped the women, forcibly bought and sold the Jurchens' belongings, and often beat the Jurchens for no reason. The Jurchens were humiliated by the Liao.
In the early stage of the Jurchen attack on the Liao state led by Yan Akuta, it mainly eliminated the main army of the Liao state after four battles.
The first time: Guanyan Akuta led the Jurchen army to attack Jiangning Prefecture, and met the Liao army in Jiangning territory, and Guanyan Akuta personally shot and killed the Liao general Yelü XieShi, and the Liao army was defeated, trampling on each other in the process of escaping, killing seven-tenths of the people. During the siege, the Liao army escaped from the East Gate and was surrounded by the Jurchen army, and the entire army was destroyed.
The second time: Emperor Tianzuo heard that Jiangning Prefecture had fallen, and immediately sent 100,000 troops to attack Ah Kuanta, and the two armies confronted each other at Chuhedian (present-day southwest of Zhaoyuan, Heilongjiang), when suddenly the wind was fierce, the sand and dust were all over the sky, and the Jurchens took the opportunity to attack, and the Liao army was defeated.
The third time: After yan akuta led an army to attack Huanglongfu (huanglongfu, an important stronghold of the Liao state controlling Jurchen, in present-day Nong'an, Jilin), the Tianzuo Emperor sent the general Yelü Yuliduo to lead 200,000 cavalry and 70,000 infantry support, but was ambushed by Guanyan Akuta, the Liao army infantry was completely destroyed, and the Jin army captured Huanglongfu.
The fourth time: Emperor Tianzuo heard of the fall of Huanglong Province, personally led the Khitan and Han combined forces of 700,000, the soldiers attacked Ah Kuan in two ways, but the Liao general Yelü Zhangnu fled to Liao Shangjing (southeast of present-day Balin Zuoqi, Inner Mongolia), supported the Yan king Yelü Chun as emperor, The Liao Tianzuo Emperor withdrew his army in a hurry, ready to quell the rebellion, Ah KuanDa learned the news, with 20,000 elite cavalry to pursue, at the guard of the foot Dagang (present-day Wuchangxi, Heilongjiang) to catch up with the Liao army, at that time the Liao army was defenseless, Ah Kuanta led the cavalry to attack the Chinese army where The Tianzuo Emperor was located, after repeated charge and killing, The Liao army collapsed in all directions, fled in defeat, and the Liao Tianzuo Emperor was even more frightened to flee 500 miles overnight.
In this battle, the main force of the Liao army was lost, and Emperor Tianzuo of Liao sent emissaries to negotiate peace with Yan Aku, but was sternly rejected by Yan Akuo. In 1125, the Jin army captured Emperor Tianzuo of Liao at Ying Prefecture (present-day Ying County, Shanxi), who was preparing to flee to Western Xia, and the Liao state fell.
<h1>The Liao state is vast, the national strength is strong, the army is strong, why can the Jin state achieve the final victory in the war with the Liao state? </h1>
I think there are the following reasons:
First, there was a rebellion within the Liao state, and the Liao general Yelü Zhangnu supported yelü Chun, the king of Yan, as emperor, dragging down the overall layout of the Liao state, especially the Liao Tianzuo Emperor temporarily withdrew his army to suppress the rebellion on the way to attack the Jin army, and was attacked by 20,000 elite cavalry led by Yan Aku, and the main army was lost.
Second, the people of all ethnic groups in the Liao state could not bear the oppression of the Khitan nobles and revolted one after another. In particular, Gao Yongchang, a Bohai man, occupied more than 50 cities in the Liaodong Peninsula, including Liao's Tokyo (present-day Liaoyang, Liaoning).
Third, Emperor Huizong of Song saw that the Liao army had been defeated repeatedly, and thought that the Liao army was vulnerable and was a favorable opportunity to recover Youyun Sixteen Prefectures, so he signed an "alliance on the sea" with the Jin army and prepared to attack the Liao state together with the Jin army, although the agreed time was missed because of the Fang La uprising, but after the Song army commander Tong Guan suppressed the Fang La uprising, he immediately led the army to attack the Liao state of Nanjing (present-day Beijing), although it was twice defeated by the Liao army, but it also contained a lot of energy of the Liao army.
Fourth, the establishment of the Meng'an Mouke system to manage the Jurchen soldiers and their families made the tribe's military strength strong, and the Jurchen army became the most powerful army at that time.
Conclusion: Don't forget when you are proud, don't be sad when you are frustrated. Emperor Tianzuo of the Liao Kingdom was overwhelmed and offended yan A bone, thus dying and destroying the country. Be a person to leave a line, see each other in the future, you must know that thirty years of Hedong, thirty years of Hexi, people always have a day to turn over.
Are you right?
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