In order to stabilize the situation in Vietnam, the Ming Dynasty spent millions of taels of silver every year, but the return was pitiful. The re-emergence of northern Mongolian forces has always been a threat to the Ming Dynasty. Due to years of war, the Ming Dynasty had little money to maintain its military operations in Vietnam. In this case, Zhu Zhanji, Emperor Xuanzong of Ming Dynasty, abandoned Vietnam and withdrew all troops and officials from Vietnam. Vietnam is independent again.