《资治通鉴·唐纪·唐纪六十八》
二月，癸未朔，南诏蛮军架云梯和冲车向成都城四面围攻，城上唐军用环钩套住云梯，向下浇滚烫的沸油，并投火焚烧，城下攻城的蛮军大都被烧死。
二月，癸未朔，蛮合梯冲四面攻成都，城上以钩缳挽之使近，投火沃油焚之，攻者皆死。
In February, on the first day of the month, the Nanzhao barbarians used siege ladders and battering rams to surround Chengdu four times, the Tang army on the city used hook rings to hook the siege ladders, and poured boiling hot oil down, and then threw fire in to burn them, many of the barbarians who attacked the city below were burned to death.