In Yunyang's Fang County, on the border between the provinces of Hunan and Guangdong, there is a mountain of enormous magnitude called House Peak. Its name is derived from the roomlike caves that flank its four sides. Its height and isolation make it treacherous to venture near.
Living in this mountain are a people whose bodies are covered with hair and who measure over ten feet. Every so often they venture from the mountain to steal the nearby villagers' livestock for food. If anyone dared to try to prevent this theft, the hairy people would retaliate while retreating with the animals they had snatched. Firearms provided no protection since the lead shot would simply bounce off the hairy people and fall to the ground, leaving them completely unharmed. Traditional wisdom maintains there is only one way of preventing their rampages, and that is to clap your hands and shout, "Build a great wall! Build a great wall!" On hearing this, the hairy people run away in terror.
A lifelong friend of mine by the name of Zhang Qun held an official post in this region and his experience confirms the efficacy of this tactic.
The locals explained the phenomenon thus: "In the Qin dynasty during the building of the Great Wall, some of the villagers avoided conscription by hiding in the mountains. After many years they evolved into these strange hairy creatures. We noticed that whenever they came into contact with other people, they would ask whether the Great Wall was completed, thereby exposing their weak point and enabling us to frighten them away."
One can appreciate how fierce the emperor of Qin must have been if after several thousand years these people still lived in terror of Qin laws.