9.10

Chapter: The Army on the March 9.10
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Translation:

These are the four useful branches of military knowledge which enabled the Yellow Emperor to vanquish four several sovereigns.

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Commentary

The four terrains that affect marching are high ground, rivers, salt marshes and dry level ground.

In general the idea is to understand the ground over which you are travelling, knowing the advantage and disadvantage these may confer.

In business, the changing competitive landscape also provides contexts to be avoided and points at which decisions are needed.