曹公征乌桓，诸将曰：“深入远征，万一刘表使刘备袭许，悔无及也。”郭嘉曰：“刘表坐谈客耳，自知才不足以御备，重用之则恐不能制，轻之则备不为用。虽违国远征，无忧矣。公遂征之。
To view this video please enable JavaScript,and consider upgrading to a web browser that supports HTML5 video
This is a modal window.
Beginning of dialog window.Escape will cancel and close the window.
End of dialog window.