As Yu's biography in the Old Book of Tang indicated that the chancellorYang Yan sent Yu to Jingnan Circuit for the purpose of having him manufacture charges against Liu Yan, who had been sent to that circuit to be a prefect — and Liu Yan was sent there and killed in 780, and Yu was soon recalled — Yu's encounter with Wu must have occurred around that time. See Old Book of Tang, vol. 118 and Zizhi Tongjian, vol. 226.
As Yu's biography in the Old Book of Tang indicated that the chancellorYang Yan sent Yu to Jingnan Circuit for the purpose of having him manufacture charges against Liu Yan, who had been sent to that circuit to be a prefect — and Liu Yan was sent there and killed in 780, and Yu was soon recalled — Yu's encounter with Wu must have occurred around that time. See Old Book of Tang, vol. 118 and Zizhi Tongjian, vol. 226.
