Meaning: when the army is fast, it should be like the wind, and the team should be neat. When the army marched slowly, it was like a silent forest, solemn and tidy, not disturbing the enemy, nor disturbing him. Be as fierce as fire when attacking. Stand still like a mountain when defending.

Source: Sun Tzu's Art of War in the Spring and Autumn Period: "Therefore, its disease is like the wind, and its Xu Rulin is like fire, and it does not move like a mountain. It is hard to know that it is a shadow, it moves like Lei Zhen. "

When the troops move quickly, it is like a strong wind rotating; When marching calmly, it unfolds slowly like a forest; When attacking the city and plundering the land, it is in full swing; When stationed in defense, it is like a mountain; When the military situation is hidden, it is like a dark cloud covering the sun; When the army came out, it was thunderous. When the military situation is hidden, it is like a dark cloud covering the sun; When the army came out, it was thunderous.

Extended data:

This sentence describes the situation of military struggle. In the Art of War, there is this sentence to describe the method of military struggle.

Sun Tzu put forward the guiding principle of "seeking troops by fraud, making profits by action, and changing from division to integration". That is to say, it is necessary to be treacherous and changeable to succeed in using troops, to take action according to whether it is beneficial, to disperse or concentrate on using troops, and to adapt to the times. When the advantages are available, the marching speed is "as fast as the wind"; When there is no profit, the marching speed is "its Xu Rulin". Attack is "like fire"; When defending, "don't move like a mountain." When it is dark, it looks like a cloud covering the sun, and when it is charged, it looks like thunder and wind.

In the process of receiving the enemy, the transformation of the command phalanx is very important. The concentration and dispersion of troops, the so-called "exchange of points for integration", are all commanded by drums and flags. Sun Tzu mentioned the night battle here. He advocated "full of war at night and full of flags at day" to change people's eyes and ears. "The brave can't advance alone, and the fearful can't retreat alone", that is, the battle should be unified in command and action.

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