《资治通鉴·后唐纪·后唐纪八》
辛酉，石敬瑭表奏振武节度使杨檀在边境上还击契丹，把他们打回去了。
辛酉，敬瑭奏振武节度使杨檀击契丹于境上，却之。
Xinyou (day 30), Shi Jingtang submitted a memorial stating that Zhenwu Military Governor Yang Tan fought back against Khitan at the border and repelled them.