The Solitary Sword of the North

In the winter of the seventeenth year of Yonghui, three things were buried outside Yanmen Pass in the northwest: A monument without words buries three hundred thousand iron-armored souls; A half-cut knife with the inscription "Those who guard the country will not kneel to the imperial power"; There is also a blood-stained book "Mountains and Rivers", which describes all the chess games in the world, but it cannot calculate the human heart.