《后汉书·列传·皇甫张段列传》
征召任度辽将军，到营几个月，上书荐中郎将张奂代替自己。
征拜度辽将军，至营数月，上书荐中郎将张奂以自代。
Conscripted as General of Deploying Across the Liao (River); after being in the camp for several months, he wrote a memorial to recommend Prefect General Zhang Huan as his replacement.