Li Zicheng
After the collapse of the Ming dynasty, Wu and his army became a vital military force in deciding the fate of China. Both Dorgon and Li Zicheng tried to gain Wu's support. Li Zicheng took a number of measures to secure Wu's surrender, granting silver, gold, a dukedom, and most crucially by capturing Wu's father Wu Xiang, ordering the latter to write a letter to persuade Wu to pledge allegiance to Li.