《三国志·魏书·诸夏侯曹传》
张当供认曹爽和何宴等人密谋造反，已经开始训练将士，打算在三月中旬起兵，于是司马懿将何宴等人收押投入大牢。
当陈爽与晏等阴谋反逆，并先习兵，须三月中欲发，於是收晏等下狱。
Zhang Dang confessed that Cao Shuang and He Yan plotted rebellion and had begun to train soldiers and planned to raise troops in mid-March, so Sima Yi arrested and imprisoned He Yan and others.