Bo Pi vs Zhang Yi

Bo Pi, a minister of Wu, accepted bribes from the state of Yue during negotiations after Wu's victory over Yue. This led him to persuade King Fuchai of Wu to spare Yue rather than annex it, a decision that later contributed to Wu's destruction.

Bo Pi continued to undermine Wu's defenses by slandering loyal generals like Wu Zixu and providing intelligence to Yue. When Yue invaded Wu, Bo Pi's actions facilitated the fall of the Wu capital, leading to King Fuchai's suicide and Wu's annexation by Yue.

After Yue conquered Wu, King Goujian of Yue executed Bo Pi for his disloyalty to his own state. Goujian considered Bo Pi a treacherous minister who could not be trusted, ending his life as a traitor to both Wu and Yue.

Zhang Yi served as a strategist for the state of Qin, promoting the 'horizontal alliance' (lianheng) policy. This strategy involved Qin allying with distant states to attack nearby ones, weakening the other Warring States and facilitating Qin's expansion.

Zhang Yi was appointed as chancellor (xiang) of Qin, a position he used to implement his diplomatic strategies. His tenure strengthened Qin's position among the Warring States through a combination of alliances and military pressure.

Zhang Yi promised King Huai of Chu 600 li of land in exchange for breaking the alliance with Qi. After Chu complied, Zhang Yi claimed he had only promised 6 li, causing Chu to attack Qin and suffer a major defeat at Danyang.