The form of an army resembles running water. Water avoids high ground and rushes to low places; an army shuns the enemy’s strength and strikes their weakness.
Water shapes its course according to the land; an army secures victory according to the enemy’s situation.
Thus warfare has no constant momentum, just as water has no fixed shape. He who adapts to the enemy’s changes and wins is truly a master of war.
The five elements never dominate forever; the four seasons never stay unchanged. Days differ in length, and the moon waxes and wanes. All things are in perpetual transformation.
Note
This chapter uses water as a metaphor for warfare: evade enemy strength and strike weaknesses. Armies adjust tactics like water shifting course. War has no fixed formation; commanders who flexibly adapt to foes’ shifting situations earn the title of master strategist.
A great military strategist and thinker in ancient China, who lived in the late Spring and Autumn Period. He authored The Art of War, the world’s earliest and most influential military classic. His strategic thoughts have been widely applied in military, politics and management worldwide.
Army like water
The classic metaphor for flexible warfare and avoiding strength to attack weakness.
No constant momentum
There is no fixed tactic in war; adaptability is essential.
Five elements & four seasons
Traditional Chinese philosophical concepts illustrating eternal changes in nature.
Master of war
A compliment for commanders who excel at adapting to battlefield shifts.
夫兵形象水，水之形，避高而趨下：兵之形，避實而擊虛；水因地而制流，兵因敵而制勝。故兵無常勢，水無常形；能因敵變化而取勝，謂之神。故五行無常勝，四時無常位，日有短長，月有死生。
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