Explaination: Defeat the enemy from within by infiltrating the enemy's camp under the guise of cooperation, surrender, or peace treaties. In this way you can discover his weakness and then, when the enemy's guard is relaxed, strike directly at the source of his strength.

In the historical novel Romance of the Three Kingdoms, by Luo Guanzhong, Han Fu participated in the coalition against Dong Zhuo. After the coalition is broken, he returned to Jizhou. Yuan Shao, whose troops are supported by Han Fu begins to look at the options to remove his dependency on the food shipment from Han Fu to maintain his troops. Following Feng Ji's advice, Yuan Shao pretended to be willing to divide Han Fu's territory with Gongsun Zan if he attacks Han Fu. Seeing the incoming invasion from Gongsun Zan, the frightened Han Fu surrendered his territory to Yuan Shao although a number of officials pleaded for him to reconsider. After Yuan Shao took over Jizhou, he kept the territory for himself, which infuriated Gongsun Zan, and stripped Han Fu's rank. The disappointed Han Fu left everything, including his family and went to seek refuge.