The author background of Cao Gui's debate.

This war took place in the tenth year of Duke Zhuang of Lu (684 BC), and it was the second war launched against Lu after he ascended the throne. Two years ago, Qi Huangong (son Xiaobai) and his younger brother Miyako fought fiercely for the throne. However, Sun Ignorant (his cousin) who usurped the throne has been killed, and Qi has no monarch for a while, so Gong Zijiu who took refuge in Lu and his son who took refuge in Ju rushed back to Qi. Duke Zhuang of Lu supported Gong Zijiu, personally led an army to escort Gong Zijiu back to Qi, and sent Guan Zhong to intercept and assassinate his son Xiaobai. However, Lu's plan failed, and his son unexpectedly ascended the throne first. After Qi Huangong acceded to the throne, he immediately counterattacked Lu Jun. The two armies fought in Qi, and Qi Lu Sheng was defeated. Taking advantage of people's danger, he coerced Lu to kill Gong Zijiu. Although Qi Huangong consolidated his authority in his brother's blood. But he has always held a grudge against Lu, so he sent troops to attack Lu again in the spring of the following year and took military revenge and punishment. The place of the battle was Lu's gourd ladle, so it is called the gourd ladle battle in history. As a result, the weak Lu defeated the invading powerful Qi State. This article is about the battle of Lu Changshao.