EARTH comprises distances, great and small; danger and secur... ss. 1.8, Chapter 1: Laying Plans

(4) narrow passes; (5) precipitous heights; (6) positions at... ss. 10.1, Chapter 10: Terrain

With regard to NARROW PASSES, if you can occupy them first, ... ss. 10.8, Chapter 10: Terrain

When you have the enemy's strongholds on your rear, and narr... ss. 11.45, Chapter 11: The Nine Situations

On the day that you take up your command, block the frontier... ss. 11.63, Chapter 11: The Nine Situations