How did the art of war develop in the Three Kingdoms, the Jin Dynasty and the Southern and Northern Dynasties?

During the Three Kingdoms, the Jin Dynasty and the Southern and Northern Dynasties, the long-term separatist regime and the heroic struggle stimulated the in-depth study of Ding's art of war. On the other hand, ethnic integration has also spread some combat skills and weapons and equipment of northern ethnic minorities to the Central Plains, enriching the objects and materials of military research. During this period, wars were frequent and widespread, and water wars were mentioned in a strategic position, and armored cavalry and armored men gradually became the main force of the army. In wars of all sizes, the battle of Guandu between Cao Yuan and Cao Cao in the Three Kingdoms period, the battle of Yiling between Cao Wu and Battle of Red Cliffs, and the battle of Feishui between the former Qin Dynasty and the Eastern Jin Dynasty in the Sixteen Kingdoms period are all famous examples. The turbulent situation and rich war practice have created famous advisers or generals such as Cao Cao, Zhuge Liang, Sun Quan, Zhou Yu, Sima Yi, Ho Choi and Yu Wentai. There were dozens of military books produced in this period, but most of them were lost. There are three volumes of Cao Cao's Wei Wudi's Letter to Sun Tzu, one volume of Sun Tzu's Art of War by Sima Biao in the Jin Dynasty, and one volume of Strategy. There are also many military books named after Zhuge Liang's works, such as General Garden, Wonders of Wuhou, Examples of Martial Arts of Wuhou, Strategies of Wuhou Soldiers, Sixteen Strategies, Seven Books of Wuhou Soldiers, etc. Which of these art books is really Zhuge Liang's work remains to be further verified.