《后汉书·列传·南匈奴列传》
四年春天，檀派一千多骑兵入侵常山、中山，朝廷以西域校尉梁懂兼摄度辽将军，与辽东太守耿夔打败了敌人。
四年春，檀遣千余骑寇常山、中山，以西域校尉梁行度辽将军，与辽东太守耿夔击破之。
In the spring of the fourth year, Tan dispatched over a thousand cavalry to invade Changshan and Zhongshan. The imperial court therefore appointed Protectorate Commander in the Western Territories Liang Tong also in charge of being General for Crossing the Liao, to team up with Liaodong Prefect Geng Kui to defeat the enemy.