《资治通鉴·唐纪·唐纪二十一》
先是，契丹破营州，获唐俘数百，囚之地牢，闻唐兵将至，使守牢绐之曰： 吾辈家属，饥寒不能自存，唯俟官军至即降耳。 
先是，契丹破营州，获唐俘数百，囚之地牢，闻唐兵将至，使守牢绐之曰： 吾辈家属，饥寒不能自存，唯俟官军至即降耳。 
First, Qidan broke into the battalion, captured hundreds of Tang prisoners, and imprisoned them in the dungeon. Hearing that the Tang troops were about to arrive, they instructed the dungeon guards to deceive them, saying: "Our families are starving and freezing and cannot survive on their own. We are just waiting for the imperial army to arrive and surrender."