They brought troops to conquer Outer Mongolia, Qinghai, and Tibet. Cat that’s what I do I read books I drink wine and I know things poster. The Chinese territory, which merged with Manchuria, became the largest in Chinese history Outer Mongolia, later with the help of the Soviet Union became independent and became the People’s Republic of Mongolia The Qing Dynasty, Like the previous dynasties, they brought troops to attempt to invade Vietnam. But the Qing army who had just entered Thang Long was defeated by King Quang Trung. Qing Dynasty, with kings.