In history, the population plummeted after foreign invasion and rape. Who knows the sheep man?

You should be talking about the May 4th period. Heaven is clear, and retribution is unpleasant. Wei Mohan stepped forward and was murdered. After the Jin Dynasty destroyed Wei, the national strength was greatly damaged, which led to alien peeping and massive invasion. The Western Jin Dynasty perished and the Eastern Jin Dynasty began in the south of the Yangtze River. The darkest era has ushered in the north, and the Han people are ten rooms and nine empty rooms, and thousands of miles are uninhabited. The Jin Dynasty was replaced, the Northern Dynasty was established by foreigners, and history entered the Southern and Northern Dynasties. The Han people in the north are almost extinct. At this time, the appearance of a person changed the situation of the Han people. He is Wu Shen Ranwu. He made a "hunting order for conference semifinals", which scared the conference semifinals from going out. Although he was finally surrounded by an enemy ten times his own, the northern people continued to carry out his orders and abandoned the soldiers killed by the Hu people. He was the real national hero. But out of national unity, he did not publicize his historical deeds.