《资治通鉴·唐纪·唐纪五十六》
李向李进言说： 蔡州的精锐兵马全都被派往洄曲及四周的边境上，在那里防御守备。防守蔡州城的兵力都是老弱残兵，可以乘蔡州空虚，直接抵达蔡州城。
李祐言于李愬曰： 蔡之精兵皆在洄曲，及四境拒守，守州城者皆羸老之卒，可以乘虚直抵其城。
Li suggested to Li: The elite soldiers in Caizhou have all been dispatched to Huicurve and the surrounding borders, where they are defending. The troops defending Caizhou City are all old and weak, so we can take advantage of the emptiness of Caizhou and go directly to Caizhou City.