In May of the 4th year of Xuanhe in the Northern Song Dynasty, Song Huizong promoted Cai You to be Fu Xuan's deputy envoy in Hedong, Hebei Province, and assisted Tong Guan in attacking Liao. Although Cai You was not familiar with military affairs, his confidence exploded at this time, and everyone praised him for easily defeating Liao. Before the army marched, Cai You entered the palace as usual to bid farewell to Song Huizong. It happened that Song Huizong had two stunning beauties in her arms. Cai You actually pointed to them and said to Song Huizong, "When I come back from winning the battle, I want your majesty to reward me." Upon hearing this, Song Huizong just smiled and didn't blame him.

It turned out that the Song Dynasty and the State of Jin secretly reached a "maritime alliance" to attack the State of Liao in order to recover the sixteen states of Youyun with military strategic significance, and also to save the financial burden and stop giving the State of Liao lucky money. Desire is full, but reality is very skinny. Under the command of Tong Guan and Cai You, Song Jun was defeated by the losing Liao army. The corrupt Song Dynasty politics and the weak Song Dynasty army were exposed to the world, which made people laugh and give generously. This also left endless hidden dangers for the later Xu Jin army to attack the Song Dynasty in the south.

Treacherous court official Cai Jing's son, Cai You, is a standard official second-generation dude, who is best at accompanying Song Huizong to eat, drink and be merry. Song Huizong decided to attack Liao, but entrusted eunuchs who were not familiar with military affairs, Tong Guan and Cai You, as viceroy and deputy viceroy, to lead troops. How could the Song Dynasty be unbeaten?

When you send troops, you will use energy when you choose. Song Huizong really didn't know that Cai You was a jester who accompanied him to eat, drink and be merry? Song Huizong's decision obviously inherited the policy of Zhao Kuangyin, the founding emperor of the Song Dynasty, to govern the army. He would rather entrust important tasks to military laymen than leave promotion opportunities to military commanders. At that time, Mao said, "If a country has no external worries, it must have internal worries, and external worries can be prevented." However, there is no sign of evil. If it is an internal problem, you can be afraid. "The emperor of the Song Dynasty intends to weaken the political status of military commanders and put an end to the possibility of them mastering state power; At the same time, the focus of military defense is to guard the capital rather than the border.

Cai You naturally has no good end. After Song Qinzong acceded to the throne, he demoted Cai You and finally sent someone to kill him. There was never a domineering warrior in the Song Dynasty, but he was beaten black and blue by neighboring countries, big and small, and he could not escape the historical fate of being an expert in civil war and a layman in foreign war.

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