The Art of War by active 6th century B.C. Sunzi

18. In raiding and plundering be like fire,

[Cf. _Shih Ching_, IV. 3. iv. 6: "Fierce as a blazing fire which no man can check."] in immovability like a mountain. [That is, when holding a position from which the enemy is trying to dislodge you, or perhaps, as Tu Yu says, when he is trying to entice you into a trap.]