When the force of the flames has reached its height, follow it up with an attack, if that is practicable; if not, stay where you are. 705

If it is possible to make an assault with fire from without, do not wait for it to break out within, but deliver your attack at a favourable moment. 706

When you start a fire, be to windward of it. Do not attack from the leeward. 707

A wind that rises in the daytime lasts long, but a night breeze soon falls. 708

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. 709