 After some deliberation, Wu Sangui decided to resist the new Shun regime, having heard that Li Zicheng had ordered Wu's family executed.On May3 and May10 Wu Sangui twice defeated the Shun vanguard led by the turncoat Tang Tong, but he knew that his force alone was insufficient to fight Li Zicheng's main army.Wu Sangui wrote to the Manchus for help, promising "great profits" if they assisted him in defeating the rebels.