300 words, 5 articles, 20 12.

One day in 3 13 BC, Zhang Yi, an envoy of the State of Qin, came to Chu and said to Chu Huaiwang, "The king of Qin is willing to form a brotherly country with the king of Qi. If the King of Qi can break off diplomatic relations with Qi, Qin will give 600 Li of land, and the two countries will be reconciled from then on. " Chu Huaiwang was very happy to hear this, so he agreed, and sent messengers to the State of Qin to take over the land with Zhang Yi. However, as soon as she entered the territory of the State of Qin, Zhang Yi pretended to fall from the car, claiming that she was ill and refused to meet the envoy of the State of Chu. When Chu Huaiwang saw that the king of Qin refused to offer his land, he thought that the king of Qin was worried that the friendship between Chu and Qi was not thorough enough, so he sent people north to scold the king of Qi. The king of Qi was furious, broke with Chu and made an alliance with Qin. When the Chu envoy asked Zhang Yi for land again, Zhang Yi said, "You can't have the land of 600 miles. You must have misheard me. Only six Li wide. " Chu Huaiwang found himself cheated and decided to send troops to attack the State of Qin. As a result, it was attacked by Qin and Qi, and Chu was defeated. Then in the battle of Lantian, the State of Chu was defeated by the State of Qin and split in two. Since then, Chu has never recovered. This is a typical example of Zhang Yi's adoption of Lian Heng policy to help the king of Qin alienate enemy allies and expand Qin's influence.

United Lian Heng is a foreign policy choice, which is related to a country's future. People attach importance to its historical role, which is also the embodiment of wisdom.