Sun Tzu establishes the five fundamental factors of warfare — Moral Law, Heaven, Earth, the Commander, and Method — and introduces the doctrine that all warfare is based on deception.

Sun Tzu addresses the economics of warfare — the cost of maintaining armies, the danger of prolonged campaigns, and the imperative of speed and efficiency in military operations.

Sun Tzu articulates the hierarchy of strategic excellence — best to win without fighting, worst to besiege cities — and introduces the famous dictum about knowing oneself and the enemy.

Chapters 4 and 5 address defensive and offensive positioning, the distinction between orthodox and unorthodox tactics, and the concept of strategic energy — the accumulated force released at the decisive moment.

Chapters 6 and 7 address the exploitation of the enemy's vulnerabilities, the principle of attacking where the enemy is unprepared, and the challenges of maneuvering armies into advantageous positions.

Chapters 8 and 9 address tactical flexibility — knowing when rules must be broken — and the practical skills of reading terrain, interpreting enemy movements, and maintaining discipline on the march.

Chapters 10 through 12 address the classification of terrain types, the nine strategic situations an army may face, the psychology of troops in desperate conditions, and the tactical use of fire as a weapon.

The final chapter elevates espionage to the pinnacle of strategic practice — arguing that foreknowledge, obtained through human intelligence, is the foundation upon which all successful warfare rests.