9.6

Chapter: The Army on the March 9.6
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Translation:

Moor your craft higher up than the enemy, and facing the sun. Do not move up-stream to meet the enemy. So much for river warfare.

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Commentary

Upriver is like uphill. When your boats are upriver, you can use the current to sweep down on them. You can also drift quietly down at night to them.

Always use the natural advantages that terrain may offer you.