У Саньгуй
In 1630, while gathering information about the enemy, Wu's father, Wu Xiang, was encircled by tens of thousands of Qing troops. Wu was denied help from his maternal uncle, Zu Dashou, and so decided to rescue his father with a force of about 20 soldiers chosen from his personal retinue. The Manchus being bewildered by the small Ming cavalry force, Wu Sangui and his men charged into the enemy encirclement, killed the Manchu general and saved Wu Xiang. Both Hong Taiji and Zu Dashou were impressed by Wu's valour, and Zu Dashou recommended Wu's promotion. Wu Sangui gained the position of guerrilla general when he was no older than 20.