He cited an example here, which is the Xiangshui chemical boundary.

This was the agreement between Soochow and Western Shu back then. At that time, Cao Cao wanted to attack Hanzhong, and Soochow wanted to plot Jingzhou. Liu Bei thought repeatedly about delimiting the border with Soochow by the Xiang River, and gave Changsha County and Guiyang County to Soochow, allowing him to send troops to Huainan.

Attack Cao Cao.

There is this passage in The Romance of the Three Kingdoms: Zhuge Liang left Jingzhou and went to Sichuan to rescue Liu Bei. Before leaving, he asked Guan Yu, who stayed behind to guard Jingzhou.

What if Cao Cao invades?

Guan Yu said to refuse with force.

Zhuge Liang asked Guan Yu again, what if Cao Cao and Sun Quan invaded at the same time?

Guan Yu said that he should divide his troops and take advantage of them.

Zhuge Liang said that it was over. I will give you eight words: "Reject Cao Cao in the north, and conquer Sun Quan in the east."

Therefore, Zhang Yue's strategy was to 'conquer the Qing and Tang Dynasties in the west and reject Xixia in the north'.

Zhang Yue said in Zha Zi that the biggest taboo in using troops is to be prepared for the left and the right will be few, and if you are prepared for the right, the left will be few. If you are not prepared for everything, you will be few for everything. If you want everything, you will get nothing.

As the saying goes, if you save people and lose land, everyone and land will survive. If you save land and lose people, everyone and land will be lost.

As long as Xixia's attack is defeated and the momentum of the Liao Kingdom is overwhelmed, Huangzhou will only temporarily lend the bones to Ali, and even the entire Qingtang can get them back in the future.

The meaning of not fighting for the gain or loss of a city or a land is to fight for power but not land, to fight for things but not for things.
Chapter completed!