What is the stone pier behind the gate of Shenyang Forbidden City?

This is called tying the horse stone, and later generations will use it to block the door. Put it on the horse farm on the west road of the Forbidden City in Shenyang. Each stone tied to a horse weighs about 300 Jin. At that time, it was stipulated in the Eight Banners that a person had to lift it to be eligible for enlistment. However, people have other uses. Only when a boy holds it up can he represent adulthood and get a wife. You trust the wrong person.