This poem is from Du Fu's Eight Arrays. Described the scene that Wei defeated Wu: You made great achievements in the Three Kingdoms, created the Eight Arrays, and achieved great success. The river flowing eastward can't push you to lay stones, and you will regret that you didn't destroy Wu.
Lu Xun strayed into Kong Ming's Eight Arrays, and the divided Three Kingdoms were all bound by his greatness, and the Eight Faces Castle was built on his prestige. This river won't divert the stones from your disposal, and you will always regret that you will destroy Wu's unwise.
Liu Bei, the Emperor Zhaolie who just ascended the throne, took revenge for Guan Yu and forced Wu Dong to die, regardless of the dissuasion of his ministers. He was burned to death by Lu Xun, commander-in-chief of the State of Wu, and retreated into the city. Lu Xun chased after him, rushed to Yupupu, strayed into the eighth array, and almost died. Thanks to Huang's guidance, he was able to save his life and the lives of the three armed forces.
Maybe someone resented Huang for meddling and not helping Lu Xun.