両広総督
By the end of 1809, the tides were turning against Zheng Yi Sao and the Pirate Confederation. Guo Podai, leader of the Black Flag Fleet, refused to reinforce Zheng Yi Sao and Zhang Bao during the Battle of Tung Chung Bay, and later openly battled with Zhang Bao near Humen. On January 13, 1810, Guo Podai officially surrendered to the Viceroy of Liangguang, Bai Ling, and was rewarded with the rank of sublieutenant ().