10. Terrain

English translation

Sun Zi lists six ground types: open, hanging, branching, narrow, perilous, and distant. In open terrain both sides can go and return, so occupy high ground and control supply routes first.

In hanging ground, entry is easy but withdrawal is hard; if the enemy is unprepared, striking first may win; if prepared, advancing is not profitable.

In branching ground, both sides can enter but neither gains clear advantage, so do not rush out. Draw the enemy partway before engaging.

In narrow terrain, if we occupy first we fill it with force; if the enemy occupies fully first, do not follow him in, but if he is not yet full, exploit the gap.

This is a doctrine of entry and exit. Tactical value comes from controlling commitment points, not from seizing ground for its own sake.

English translation

For perilous terrain, occupy it first on high, sun-facing ground and wait. If the enemy occupies first, draw him away and do not follow.

In distant terrain, strengths are roughly balanced, making deliberate challenge difficult and usually unrewarding.

This completes the sixfold terrain framework. A commander must judge whether a position is actually usable before committing force.

English translation

Sun Zi lists six ways an army can fail: running apart, slackness, collapse of ranks, immediate breakdown, disorder, and reckless deployment. These are failures of command, not acts of heaven.

When forces are matched, pressing forward as if one-sided decisive shock is possible creates panic and retreat; when troops are strong but subordinate officers weak, discipline breaks. When leaders are forceful but soldiers are weak, the line is easy to split. If a major officer is angry and disobeyed, he may fight impulsively, while the commander misjudges unit capability, and the army fractures.

The passage maps battlefield defeat to concrete command functions: balance, discipline, and judgment. It tells a modern manager that a losing system often begins with micro-failures in leadership, not with external shocks.

English translation

Terrain is an aid, not the decision itself. The general’s path is to evaluate the enemy and then choose action by distance, terrain hazards, and timing. If this is done, victory is likely; if not, defeat is likely.

So when the operational logic is sound, even a ruler’s restraint can be overridden to act; when the logic is unsound, even an order to fight cannot force success. A good campaign does not chase personal glory in advance, nor retreat merely to avoid blame. It preserves people and aligns gain with legitimate command objectives, which is the state’s real treasure.

This passage joins terrain, enemy assessment, and state interest. The responsible commander advances without chasing fame and withdraws without merely fearing blame.

English translation

Treat soldiers with care like a child in formation, and they can follow you into a deep ravine. Treat them with filial concern, and they can stand with you even in death.

Yet kindness without command does not work: if a leader is affectionate but cannot issue and enforce orders, and cannot restore disorder, the force becomes like a pampered child—emotionally attached but unreliable in action.

Care and discipline must travel together. Affection without enforceable order produces a force that cannot be directed.

English translation

If one knows one’s own troops can strike but does not know that the enemy cannot, success is only partial. If one knows where the enemy can be struck but not where one’s own troops cannot operate, success is also partial. If one knows both sides are striking-capable yet ignores terrain unsuited for battle, the gain is still only half.

A real strategist moves without confusion and does not exhaust options in execution.

Victory requires three checks at once: whether one’s troops can fight, whether the enemy can be struck, and whether the terrain permits battle.