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In the fifteenth year since the founding of the Yan Kingdom, some people caused rebellion in Longxi. In September of that year, Mu Zong led the princes on an autumn hunt at Mulan Paddock. Assassinated by thieves, none of the emperor's five sons escaped. The only youngest son suffered an illness in the palace and was spared. At the end of September, the Fan people had already invaded our five counties in Longxi, and one-fifth of Dayan's territory had been captured! The country was in danger, and the Empress Dowager Cisheng urgently compiled a letter of credence to ask for help from Gaochang.