9.13

Chapter: The Army on the March 9.13
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Translation:

When you come to a hill or a bank, occupy the sunny side, with the slope on your right rear. Thus you will at once act for the benefit of your soldiers and utilize the natural advantages of the ground.

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Commentary

Troops will be warmed by the sun on a slope. Occupying a slope allows you to sweep down on an enemy.

With the slope behind you, you face the oncoming army. It does not matter whether it is left or right.