In 403 BC, the three major families of Jin, with the approval of the Zhou king, partition Jin into three states: the State of Han , the State of Zhao , and the State of Wei . The three family heads were given the title of Marquess. The State of Jin continued to exist with a tiny piece of territory until 376 BC when the rest of the territory was partitioned by the Three Jins.
In 371 BC, Marquess Wu of Wei passed away without specifying a successor, causing Wei to fall into an internal war of succession. After three years of civil war, Zhao and Han, sensing an opportunity, invaded Wei. On the verge of conquering Wei, the leaders of Zhao and Han fell into disagreement on what to do with Wei and both armies mysteriously retreated. As a result, King Hui of Wei was able to ascend onto the throne of Wei.
In 354 BC, King Hui of Wei initiated a large scale attack at Zhao. By 353 BC , Zhao was losing badly, and one of their major cities--Handan, a city that will eventually become Zhao's capital--was being besieged. As a result, the neighbouring State of Qi decided to help Zhao. The strategy Qi used, suggested by the famous tactician Sun Bin, who at the time was the Qi army advisor, was to attack Wei's territory while the main Wei army is busy sieging Zhao, forcing Wei to retreat. The strategy was a success; the Wei army hastily retreated, and encountered the Qi midway, culminating into the Battle of Guiling where Wei was decisively defeated. The event spawned the famous phrase " å›´éæ•‘èµµ ", meaning attacking Wei to save Zhao.
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