Li Shimin's rule of Zhenguan is a famous prosperous age in history, his literary talent and way of governing the country are also second to none, and he is not inferior to any famous people in leading troops and fighting General. Since the Tang Dynasty just defeated the Sui Dynasty and established the Tang Dynasty, Li Shimin's father Li Yuan became the emperor. Three years later, that is, in 620 years of the Gongyuan, Li Shimin was named the King of Qin at that time. At that time, it was the imperial capital of the Sui Dynasty, which occupied a very important position both politically and militarily. If Luoyang could be captured, the Sui Dynasty would have collapsed, and this is also a relatively famous battle in history, the Battle of Luoyang . Luoyang is an ancient city, where the economy is prosperous and the people live well. If it is attacked forcibly, the economy will decline and the people's livelihood will suffer. Li Shimin simply adopted the method of siege. After several months, the Sui army in the city has no ability to resist, but Just when victory was in sight, Dou Jiande came to the rescue with an army..