The second part of Lü Bu's plan is to have Zhang Xiu think that Cao Cao have taken Zhang Xiu's aunt by force which will lead to Zhang Xiu's betrayal and attack Cao Cao's camp.
The second part of Lü Bu's plan is to have Zhang Xiu think that Cao Cao have taken Zhang Xiu's aunt by force and attack Cao Cao's camp. This force will lead to Zhang Xiu's betrayal.