On the vast Dunhuang Gobi Desert, coarse sand and gravel splashed about two feet high, and a total of 13 horses galloped back and forth.This group of people were wearing dark gray male uniforms, wearing soap scarves on their heads, with knives on their waists, and carrying longbows on their backs, with a solemn expression and tracking the enemies in front of them.These thirteen people were policemen in Yumen County, Dunhuang County. Ten days ago, a group of chariots and horses that were originally planned to transport weapons, food and wages along the Hexi Corridor to the northwest border were looted by thieves in Dunhuang County, and none of the soldiers escorting the carriages and horses survived.Such a shocking case naturally fell on Jin Xian, the magistrate of Yumen County, where he was located.