There are many allusions. Let me give you an example. During the Spring and Autumn Period, Fu Cha, the king of Wu, wanted to be the hegemon, so he personally coached 50,000 elite soldiers to join the League, which led to domestic emptiness, and other vassal States were unwilling to admit their hegemony. At this time, Gou Jian, the king of Yue, took the opportunity to attack Gusu, the capital of Wu, while the king of Wu insisted on being the overlord, not only not bringing troops back.