《旧唐书·列传·卷一百三十五》
适逢契絆何力向东讨伐高丽国，军队到达檀州后，滦河泛滥，军队不能前进，檀州供给军队资金粮食，数日不匮乏。
会契苾何力东讨高丽，军众至檀州，而滦河泛涨，师不能进，供其资粮，数日不乏。
It happened that He Li was ordered to lead an expedition to the east to attack Goryeo. After the army reached Tan prefecture, Luan River flooded, and the army couldn't move forward. Tan prefecture provided funds and food for the army for several days.