《宋史·列传·卷三十二》
契丹果然侵犯石岭关，郭进大破契丹兵，又攻破敌方西龙门砦，俘割敌人左耳来献功，从此并州一带敌人丧失了斗志。
契丹果犯关，进大破之，又攻破西龙门砦，俘馘来献，自是并人丧气。
The Qidan did indeed invade Shilunggu Pass, and Guo Jin defeated the Qidan troops and captured their Xilongmen fort. He cut off the left ears of the enemies and sent them as proof of his victory. From then on, the enemies in the Bingzhou area lost their will to fight.