During the Chongzhen period of the Ming Dynasty, the Ming court killed and wounded a good soldier. At that time, there was only one elite army left in the Ming Dynasty, led by Wu Sangui, and 30,000 soldiers were called Ning Guan fighters. "Guan" refers to Shanhaiguan and "Ning" refers to Ningyuan. Ning Guan Tieqi was founded by Yuan Chonghuan, a famous soldier. Yuan said: "In order to raise Liao people on the land of Liao people, Yuan selected strong men from Liao people to enrich the army, trained many Liao generals and trained cavalry with strong fighting capacity. This unit was later called Ning Guan Warrior.

Ning Guan Tieqi is an elite force that defeated the Eight Banners Army in Ningyuan. In the ranking of the strongest troops in ancient and modern times, Ning Guan Tieqi never appeared behind the top three, which reflected the recognition of combat effectiveness. In the battle of Ningyuan, Yuan Chonghuan was defeated by138,000 flag fighters in the 10,000-person Guanning Army. In the battle of Ningjin, Ning Guan fighters completely defeated the Manchu Eight Banners army. At that time, there were only 70,000 Ming troops, and the Manchu people made it difficult for the flag-bearer defense line to cross half a step.

After Huang taiji's army entered Beijing through Mongolia, it lived in the starry night, and 9,000 customs stormed the 108,800-banner army outside Beijing. The Eight Banners Army was finally defeated. This battle should be enough to reflect the strong fighting capacity of Ning Guan soldiers. After Yuan's death, Wu Sangui was a rare elite soldier in the Ming Dynasty, and the fighters he inherited were the only Manchu army fighting with the Eight Banners at that time. In repeated battles, Wu Sangui once again released the prestige of "Guan Qi" and became a strong team that shocked the Commissioner.

"Ning Guan fighters" later followed Wu Sangui to the north, and it was not until the end of the San Francisco Rebellion that they were pacified, showing their great influence. If we don't discuss Yuan Chonghuan's era, the Warring States Period in Wu Sangui's era alone is enough to prove the strength of Ning Guan's fighters. From a military point of view, it is indeed riding Chang.

Peng recorded the situation of his troops in a straight mouth.

Guan Ningjun ran around, and the thief brushed the rope left and right, playing dozens of rounds. The result of the compound was that Li Zicheng was defeated and fled in a mess. Then, Jiang Xiang, a thief who fought against the Qing restoration, fought Liu Denglou in Yulin, defeated Zhu Sen's axe, the elite of the Ming army, and defeated Wang Yongqiang, the peasant army, in Tongguan, Pingshan, Sichuan, Guizhou, Yunnan and Nanming.

Wu Sangui's Ning Guan fighters fought from the Commissioner to the Commissioner, from the northeast to Yunnan, galloping thousands of miles across the battlefield, and his troops would win the battle and attack the enemy. Without the help of soldiers from Wu Sangui and Ning Guan, could the Qing Dynasty easily pacify the world? As far as this meritorious military service is concerned, it is well-deserved to say that Ning Guan soldiers are one of the most powerful armies in ancient and modern times.