The Great Frontier Battle took place in the fourth year of the late Qin Dynasty (in 389, the fourth year of the pre-Qin Dynasty), which was the battle of the pre-Qin frontier (now between Binxian County in Shaanxi Province and Jingchuan in Gansu Province) attacked twice by the late Qin Dynasty.
In March, four years after the founding of the People's Republic of China, the former Qin rulers paid more attention to the great border, and led more than 10,000 people to conquer stability (now Jingchuan County, Hebei Province, Gansu Province) and build forts.
In May, he sent his troops to attack the post-Qin dynasty, and he was defeated repeatedly. At the end of the Qin Dynasty, Emperor Yao Chang sent his son, General Yao Chong of Zhong Jun, to attack Victory. However, he was aware of it in advance, so he did the opposite, defeated Yao Chong, captured and beheaded 25,000 people in Anqiu (now Lingtai, Gansu).
In July, Pingliang (now Huating West, Gansu) was conquered.
In August, Mao Deng advanced to maintain stability according to Goutouyuan (now northwest of Jingzhou, Gansu). Yao Chang wanted to win with ingenuity, and left a copy of the history to keep Yao Min stable. He led 30,000 Qingqi to attack the trench of the former Qin Dynasty at night, conquered the world, killed the sons of Qin Mao and Mao Deng, and captured the famous soldiers.