The Nine Situations

Chapter 11 classifies nine types of ground, each with a rule. Dispersive ground (your own territory): unite purpose, do not fight. Frontier ground (barely entered enemy territory): keep units closely connected, do not stop. Contested ground (high-value for both sides): rush reserves forward, do not attack head-on. Open ground (free movement both ways): focus on solid defense, do not try to block the enemy. Crossroads ground (junction of three territories): build alliances. Serious ground (deep penetration): secure supplies. Difficult ground (mountains, marshes, swamps): keep moving. Enclosed ground (narrow approaches, winding retreat): use ingenuity, block all escape routes. Death ground (survival requires immediate fighting): make it clear to soldiers there is no survival except through fighting.

The chapter elaborates the psychology of death ground at length. Put soldiers in a position where there is no escape, and they will choose death over flight. When they are willing to die rather than run, officers and soldiers will fight with everything they have. Soldiers in desperate situations lose their fear. With nowhere to run, they stand firm. Deep in hostile territory, they hold together. Under these conditions, soldiers are automatically vigilant without being told, loyal without being asked, devoted without being ordered. Ban superstition and eliminate irrational fears. Then, until death itself arrives, there is nothing to be afraid of. At the decisive moment, the leader acts like someone who climbs to a height and kicks away the ladder — he takes his army deep into enemy territory and releases the bolt.

The chapter closes with the comprehensive doctrine of the invading force. On the day you take command, seal the borders, destroy official credentials, cut off unauthorized communication. Be decisive in the war council so you control the situation. If the enemy leaves an opening, rush through it. Preempt by seizing what they value most, and time your moves to control when and where the battle happens. At first, be as elusive as a shy maiden — until the enemy drops their guard. Then strike with the speed of a sprinting hare. The enemy will have no time to resist. And the image that the chapter returns to at its centre: the shuai-jan snake of the Heng mountains. Strike its head and the tail attacks; strike its tail and the head attacks; strike its middle and both attack. Can an army be made to act like this? Yes.