There is a reason people still read Sun Tzu 2500 years later, and it's not because he's been on a press tour promoting his book. The man was a consummate master of his art, if he was indeed one man. My favorite reading of The Art of War, because Baldermort has an awesome voice: https://www.youtube.com/watch?v=sDlW3WqXisM
The article notes that Sun Tzu's celebrated victory over the Chu was very short-lived, since the Chu remnants promptly allied with the Qin and the Yue to roll them back within two years, and his Wu clan was entirely exterminated within three decades.
Literally said in Chap. 3 from the Art of War:
supreme excellence consists in breaking the enemy’s resistance without fighting.