In 215 AD, Liu Bei took Yizhou, and Sun Quan ordered Zhuge Jin to ask Liu Bei for Jingzhou. Sun Quan was extremely angry when Liu Bei refused, so he sent Lu Meng to lead an army to capture the three counties of Changsha, Lingling and Guiyang. Changsha and Guiyang Shu generals surrendered immediately. After Liu Bei learned about it, he personally rushed to the Public Security Bureau (today's Hubei Public Security Bureau) from Chengdu and sent General Guan Yu to fight for the three counties. Sun Quan also immediately stationed at Lukou and sent Lu Su to garrison Yiyang to resist Guan Yu. The two sides were at war with each other, and the Sun-Liu alliance was facing a breakdown. At this critical juncture, Lu Su decided to negotiate with Guan Yu in person in order to safeguard the Sun-Liu alliance and not give Cao Cao an opportunity to take advantage of it. "Su invited Yu to meet each other, and each stationed its troops and horses at a hundred paces, but all the generals can do it alone." After talks, the two sides eased the tension. Later, Sun Quan and Liu Bei agreed to divide Jingzhou equally and "cut the Xiang River as the boundary, so they stopped their troops." Therefore, the Sun Quan and Liu Bei alliance could continue to maintain.

From "Three Kingdoms·Wu Shu·Biography of Lu Su": "Su invited Yu to meet, and each stationed its troops and horses at a hundred paces, but the general was asked to go to the meeting alone.

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Idiom: Going to a meeting alone