行军
Read the ground and read the enemy: position wisely, and learn to interpret the small signs that betray his true state. Command with humanity but hold discipline — that is the road to victory.
What this chapter says
This practical chapter covers moving and positioning an army across different terrain — mountains, rivers, marshes, plains — and, most memorably, reading the enemy from small signs. Dust rising high and sharp means chariots advancing; birds rising means an ambush lies empty; trees moving means the enemy approaches. Envoys with humble words while preparations increase mean an attack is coming; humble words and a sudden truce offer without cause mean a plot. When troops are seen leaning on their spears, they are famished; when those who draw water drink first, they are parched. On discipline, Sun Tzu is precise: soldiers must first be bound to you by humane treatment, then kept in order by iron discipline — command by kindness alone breeds soldiers you cannot use, discipline alone breeds soldiers who will not stay. Numbers are not everything: 'if our troops are no more than the enemy's, that is enough' — do not advance recklessly on strength alone.
Key lines
Applied today
Learn to read weak signals: a rival's sudden hiring surge, a partner's unusually humble tone before a renewal, quiet churn in a segment. The small tells reveal a competitor's true state long before the announcement does.
Lead with genuine care first, so people are bound to you — then hold a firm line on standards. Warmth without discipline yields a team you can't rely on; discipline without warmth yields one that won't stay.