《北齐书·列传·卷二十一》
乾早就有了报复之心，当白鹞突然到来的时候，知道自己要被他们算计，于是先定谋略，暗中带领壮士，突然袭击，占领了州城，并且传檄州郡，杀死白鹞，活捉了刺史元仲宗。
乾既宿有报复之心，而白鹞忽至，知将见图，乃先机定策，潜勒壮士，袭据州城，传檄州郡，杀白鹞，执刺史元仲宗。
Gan had long been planning his revenge. When Baiyao arrived, Gan knew that they would try to scheme against them, so he first made a plan and secretly led his brave men in a surprise attack, capturing the city. He then sent out a message to the other counties, killing Baiyao and capturing the Prefect Yuan Zhongzong.