The Spring and Autumn Period : Talking on paper 紙上談兵

A long time ago, in ancient China, there was a country called Zhao, and they had a very powerful general by the name of Zhao She. Zhao She won many victories over the invading Qin army with fewer soldiers, so he was appreciated by the king of Zhao and was promoted to be a superior officer in charge of defending the country. Zhao She had a son named Zhao Kuo, who was an avid student of the military from a young age and loved to talk about strategies and tactics. He had read many books on military affairs and thus considered himself very smart and thought he could do anything. His words were often irrefutable, so he became very proud.