Chapter: The Attack by Fire 12.12
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In every army, the five developments connected with fire must be known, the movements of the stars calculated, and a watch kept for the proper days.

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Understand fire and how to control it. Understood, it can be your ally.

Movement of stars provides location information. Knowing where you are at all times is essential.

A watch outwards lets you know more of what is happening all around you. The further you can see, the more land you can command.