Job Recruitment Website - Immigration policy - What is the reason why Tatar threatened the Ming Dynasty?

What is the reason why Tatar threatened the Ming Dynasty?

It was not until Yu Qian, the minister of the Ministry of War, and others commanded the soldiers and civilians to defend Beijing, and the diligent soldiers arrived one after another, which repelled Vala's attack. After that, Vara fought internally, its power gradually declined, and Tatar gradually rose. Tomorrow, in the fifth year of Shunshun (146 1), Tatars invaded Hetao, and Shaanxi and Shanxi were greatly threatened.