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military strategy
風林火山 is the battle strategy and proverb of Japanese feudal lord Takeda Shingen (1521-1573 AD).
This came from the Art of War by Chinese strategist and tactician Sun Tzu (Sunzi).
You can think of this as an abbreviation to remind officers and troops how to conduct battle.
風林火山 is a word list: Wind, Forest, Fire, Mountain.
The more expanded meaning is supposed to be...
“Swift as the wind, quiet as the forest, fierce as fire, and immovable as a mountain”
“As fast as the wind, as quiet as the forest, as daring as fire, and immovable as the mountain”
“Move as swift as the wind, stay as silent as a forest, attack as fierce as fire, undefeatable defense like a mountain”
“Move swiftly like the wind, stay silent like the forest, attack fiercely like fire, take a tactical position on the mountain”
See Also: Art of War