《资治通鉴·晋纪·晋纪二十七》
因为道路被阻绝，任命无法通达。前秦幽州刺史王永向振威将军刘库仁求救，刘库仁派他妻子的哥哥公孙希率领三千骑兵前去救援，在蓟南大败平规的军队，乘胜长驱直入，进军占据了唐城。
秦幽州刺史王永求救于振威将军刘库仁，库仁遣其妻兄公孙希帅骑三千救之，大破平规于蓟南，乘胜长驱，进据唐城，与慕容麟相持。
Since the roads had been cut off, the appointment could not be delivered. The former Qin Yuzhou governor Wang Yong asked the general Zhenwei Liu Ku Ren for help. Liu Ku Ren sent his wife's brother Gongsun Xi to lead three thousand cavalry to rescue him, and defeated Pinggui's army in the south of Ji, and marched into the Tangcheng and took it.