During the An-Shi Rebellion, on the day Chang'an fell, Gu Chang'an, a lieutenant general of the Imperial Guard, took eighteen arrows while shielding the Crown Prince's escape. When he crawled out of a pile of corpses and returned to the ruins of the Gu estate, he found a silk document hidden in a secret compartment in the ancestral shrine, recording Yang Guifei's true origins. The torches of his pursuers were already lighting up the street corner.
