Han Art Literature and History recorded 207 articles by 12 military strategists. At the end of the Western Han Dynasty, Liu Xiangfeng, a doctor of Guanglu, asked for a collating book, and saw six kinds of manuscripts in the Royal Library, which recorded the heroic words of military strategists, with complicated contents, chaotic arrangement and incomplete words. They have several different names, such as national policy (not the current version of the Warring States policy), national events, short stories, long stories and revised versions. According to his country, Liu Xiang compiled it in a very short time, and it was designated as Chapter 33 of the Warring States Policy. In the Eastern Han Dynasty, Yin Gao annotated this book. The Sui Dynasty was incomplete, and there are only ten articles left today.
In addition to what Liu Xiang saw, there were many stories of military strategists circulating among the people at that time.