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What role did Wu Sangui and Dorgon play in the Manchu capture of Beijing?

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Map of eastern Asia highlighting Manchuria in northeastern China, which includes the provinces of Heilongjiang, Jilin, Liaoning, and part of the Inner Mongolia Autonomous Region. The highlighted area borders Russia, Mongolia, and North Korea. — Manchuria The historical region of Manchuria shown with the boundaries of the modern-day Chinese provinces in its place as well as the portion of the Inner Mongolia Autonomous Region that is often considered part of Manchuria.

The Manchu capture of Beijing in 1644 was facilitated by a strategic alliance between the Ming general Wu Sangui and the Manchu regent Dorgon.21

When the rebel leader Li Zicheng conquered Beijing and caused the suicide of the last Ming emperor, Wu Sangui—who had been defending the northeast frontier—found himself caught between the rebels and the Manchu forces. Rather than allow Li Zicheng to establish a new dynasty, Wu appealed to the Manchu for assistance.213

Dorgon, acting as regent for the young Qing emperor, accepted this appeal and led an expeditionary force into China. The combined armies of Wu Sangui and the Manchu inflicted a heavy defeat on Li Zicheng’s troops, allowing Dorgon to enter Beijing in June 1644. Following this victory, Dorgon established Beijing as the capital of the new Qing dynasty, while Wu Sangui initially served the new regime, receiving high rank and assisting in the suppression of remaining Ming resistance.231