The Art of War
When Sun Tzu first wrote The Art of War, it was not the first book on military tactics. He quotes from The Book of Military Administration by Chun Cheng. The quote is limited to the use of signal flags and drums to move soldiers. Chun's book has not survived and so little is known of what else was in it. However, books of the time were based on rules of warfare that all sides followed. War was the sport of rich noblemen. The rules were based on chivalry.