風林火山

Etymology
A contraction of the slogan on daimyō 's army banner, 「疾如風、徐如林、侵掠如火、不動如山」, originally from 's .

Noun

 * 1)  "wind-forest-fire-mountain", a military strategy that's based on the premise of being "as swift as the wind, as silent as the forest, as fierce as the fire, as firm as the mountain"