《资治通鉴·唐纪·唐纪三十二》
这一年，安西节度使封常清率兵进攻大勃律，到了菩萨劳城，先头部队多次获胜，封常清就乘胜追击。
是岁，安西节度使封常清击大勃律，至菩萨劳城，前锋屡捷，常清乘胜逐之。
In that year, Anxi Circuit Governor Feng Changqing led his troops to attack Da Bolü, arrived at Pusalau City, with the vanguard winning several consecutive victories, so Feng pursued their advantage and pressed the attack.