There were many books on military theory, and the following were some of the more common ones: 1 Sun Tzu's Art of War: The book on military tactics written by the ancient Chinese military strategist Sun Wu was hailed as the classic work of ancient Chinese military theory. "On War": The work of the German military strategist, Karl Engels, is considered the foundation of modern military theory. 3. National Defense Theory: A book written by the British military strategist Henry Mills on how to ensure national security and prevent war. 4 War and Peace: The Russian military strategist Alexander Nikolayevich Tolstoy wrote a novel about war and military struggles. It is also one of the important reference materials for modern military theory. 5 Military Science: American military scientists James H. Kelly and William R. Hawk wrote a subject that covered military science, tactics, strategy, military organization, command, and training. Modern Military Theory: The book by the American military scientist William R. Hawk is a comprehensive introduction to modern military theory, covering the forms of war, the art of war, tactics, strategy, military organization, command, and training. These are some of the common military theory books. Of course, there are many other excellent books worth reading.