10.8

Chapter: Terrain 10.8
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Translation:

With regard to narrow passes, if you can occupy them first, let them be strongly garrisoned and await the advent of the enemy.

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Commentary

Narrow passes are dangerous if the ground above can be taken and the people below showered from above. If the land above is untenable, then the pass may be held with only a few people, such as in the Spartan adventure at Thermopylae.

Building walls and a defensive garrison can turn a pass into an impregnable castle.