King Huai of Chu, who was the head of the vertical alliance, allied with Qi.

King Xuan of Qi attacked Yan and murdered the King of Yan. Hui decided to make him the prime minister. Zhang offered ideas to King Hui about ways to befriend Wei and Yan in order to break the alliance, which Hui graciously accepted. Īt that time, Su Qin's vertical alliance tactic still influenced China, and formed a sort of unity between the states of Han, Zhao, Wei, Chu, Yan and Qi. King Hui accepted him as a high minister, and in 328 BC he led a successful campaign against his native state, by which Qin acquired a large part of Wei.

It is said that on his return home, he said to his wife, 'Look and see if they have left me my tongue.' And when his wife declared that it was safe and sound, he cried out, 'If I still have my tongue, that is all I want.' He then went to the state of Qin in 329 BC, and saw King Hui of Qin, who had earlier rejected Su. He received a severe beating at a banquet in the house of a minister of Chu when he was wrongly accused of stealing a gem. After Su Qin died, Zhang left Guiguzi, and arrived at the state of Chu. Biography Ī native of the State of Wei, Zhang Yi studied under Guiguzi and learnt politics and foreign relations. He was an advocate of horizontal alliance, unlike Su Qin both were adherents of the School of Diplomacy. He was an important strategist in helping Qin to dissolve the unity of the other states, and hence pave the way for Qin to unify China. He was born in the Wei state during the Warring States period of Chinese history. Zhang Yi (before 329 BC – 309 BC ) was a Chinese military strategist and philosopher.

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