Trần Thái Tông
King Trần Thái Tông fled to an offshore island, while the Mongols occupied the capital city Thăng Long (modern-day Hanoi). They found their envoys in prison, however one of whom died. In revenge, Mongols massacred the city's inhabitants. Although the Mongols had successfully captured the capital, the provinces around the capital were still under Vietnamese control. While Chinese source material is sometimes misinterpreted as saying that Uriyangkhadai withdrew from Vietnam due to poor climate, Uriyangkhadai left Thang Long after nine days to invade the Song dynasty in modern-day Guangxi in a coordinated Mongol attack with armies attacking in Sichuan under Möngke Khan and other Mongol armies attacking in modern-day Shandong and Henan. The Mongol army gained the popular local nickname of "Buddhist enemies" because they did not loot nor kill while moving north out to Yunnan. After the loss of a prince and the capital, Trần Thái Tông submitted to the Mongols.