10.9

Chapter: Terrain 10.9
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Translation:

Should the army forestall you in occupying a pass, do not go after him if the pass is fully garrisoned, but only if it is weakly garrisoned.

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Commentary

If the other side gets to the pass first and has created a garrison, attacking this is wasteful and likely futile, like laying siege.

The best hope is that the enemy is careless and has insufficient guards, allowing you to charge in with a wholesale attack, or maybe creep in at night.