Yuan Shao who is a leader in Hebei let his general Yan Liang as avant-courier to attack White-horse Po. The several generals of Cao Cao were failed by Yan Liang, Cheng Yu recommended Guan Yu, Guan Yu rode with his blue dragon sword, running down from the hill. He rushed into Yan Liang's army directly, Yan Liang was impermissible to evade and was pulled down the horse, then Guan Yu killed his head with his sword, attached his head on the horse neck, and rush off the army with his sword, it seems has any one in there. The soldiers and generals of Hebei were all surprised by him, their army in confusion.