12. The Attack by Fire
T`sao Kung thinks that "traitors in the enemy's camp" are referred to. But Ch`en Hao is more likely to be right in saying: "We must have favorable circumstances in general, not merely traitors to help us." Chia Lin says: "We must avail ourselves of wind and dry weather."
the material for raising fire should always be kept in readiness.
Tu Mu suggests as material for making fire: "dry vegetable matter, reeds, brushwood, straw, grease, oil, etc." Here we have the material cause. Chang Yu says: "vessels for hoarding fire, stuff for lighting fires."