CHAPTER SUMMARY (12.01-12.13): Initiating Various Types of Fire Attack
[12.02] Using fire attacks depends on proper conditions. Equipment for fire attacks must be available beforehand.
[12.03] There are appropriate seasons for using fire attacks, and appropriate days for raising fires. The appropriate season is when the weather is dry and it's windy; the appropriate day is when the moon is at Chi, Pi, I, or Chen.* These four days are when there are rising winds.
[12.04] Generally, in fire attacks, you must respond according to the five changes of fire: If the fires are set inside enemy camp, you must respond quickly outside the enemy camp; if the fires are set but the enemy is calm, then wait, do not attack. Let the fire reach its height, and follow up if you can, stay* if you cannot.
[12.05] If the fire attack can be set outside, without relying on the inside, set it when the time is right. If the fire is set upwind, do not attack downwind.* If it is windy all during the day, the wind will stop at night. The army must know the five changes of fire,* to be able to calculate the appropriate days.
[12.06] Those who use fire to assist in attacks are intelligent, those who use water* to assist in attacks are powerful. Water can be used to cut off the enemy, but cannot be used to plunder.
12.03 the moon is at Chi, Pi, I, or Chen. The days the moon aligns with constellations: Chi, (Sagittarius); Pi (Andromeda); I, (Crater), and Chen (Corvus). The point is to wait for the right time for a fire attack; consider not only the weather but also the enemy's mood (strike not when the enemy's calm, but upset).
12.04 Stay. Wait to see how your enemy will respond.
12.06 Those who use water. The reference here is to those who use a river to weaken, divide enemy troops.