Art of War – Chapter 3.4

A general is the pillar of a state. If his assistance is thorough, the nation will surely prosper; if flawed, the nation will surely weaken.

There are three ways a ruler can bring trouble to the army. Ignorant of when the army must not advance, he orders it forward. Ignorant of when it must not retreat, he commands it to withdraw. This fetters the army.

Unfamiliar with military affairs yet interfering in army administration, he confuses the soldiers. Unaware of battlefield expediency yet meddling in command, he sows doubt among the troops.

When the whole army is confused and doubtful, hostile states will launch attacks. This is called disrupting one’s own army and inviting defeat.

Note

Sun Tzu (Sun Wu)

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.

Pillar of a state

It refers to the vital role of generals, who are closely linked to national rise and fall.

Fetter the army

Rulers force the army to advance or retreat against battlefield reality, restricting military flexibility.

Confusion and doubt among troops

Caused by improper intervention from the ruler, which destroys military morale and combat effectiveness.

Division of duties

A key political and military principle in ancient China. Rulers govern the state, while generals command armies on the front line.

The Battle of Changping: A Tragic Case Study

“Division of duties” (rulers governing the state, generals commanding the army) is a principle that, when violated, can lead to disaster. The historical Battle of Changping (262–260 BC) during the Warring States period serves as a perfect illustration of Sun Tzu’s warning.

Here is an analysis of how the Zhao King’s interference led to the annihilation of his army:

1. The “Fettering” of General Lian Po

Initially, General Lian Po adopted a strategy of defensive entrenchment. He recognized that the Zhao army was not strong enough to defeat the Qin army in open battle and sought to wear down the enemy through patience and logistics.

• Sun Tzu’s Principle: “Ignorant of when the army must not advance, he orders it forward.”
• The Interference: The young King Xiaocheng of Zhao, impatient with the stalemate and misled by Qin spies who spread rumors of Lian Po’s “cowardice,” lost faith in his general. The King ignored the battlefield reality and forced Lian Po to abandon his defensive posture and launch an offensive.
• The Result: This directly “fettered” the army. Lian Po was restricted from using the strategy best suited to the situation, weakening the army’s natural flexibility.

2. “Confusion and Doubt” through Reckless Replacement

The King’s interference went beyond just ordering an attack; he replaced the experienced Lian Po with the young and theoretically knowledgeable but practically inexperienced Zhao Kuo.

• Sun Tzu’s Principle: “Unaware of battlefield expediency yet meddling in command, he sows doubt among the troops.”
• The Interference: By replacing a seasoned commander mid-campaign based on political intrigue rather than military merit, the King created chaos. The troops lost confidence in their leadership. When Zhao Kuo took over, he changed the entire battle plan based on textbook theory, disregarding the actual terrain and enemy disposition.
• The Result: The army became “confused and doubtful.” The rank and file were forced to execute a strategy they did not believe in, destroying morale and combat effectiveness.

3. “Disrupting One’s Own Army and Inviting Defeat”

The final outcome of the Battle of Changping was the complete encirclement and destruction of the Zhao army. Over 400,000 Zhao soldiers were killed.

• Sun Tzu’s Principle: “When the whole army is confused and doubtful, hostile states will launch attacks. This is called disrupting one’s own army and inviting defeat.”
• The Tragedy: The Qin army, led by the formidable Bai Qi, exploited the disunity caused by the Zhao King’s interference. The Zhao army was lured into a trap and annihilated. The state of Zhao never recovered from this loss, directly leading to its eventual downfall.

Conclusion

The Battle of Changping is a stark historical validation of Sun Tzu’s warning in Chapter 3.4. The Zhao King, by violating the “Division of duties” and interfering in matters he did not understand, did not just lose a battle – he “disrupted his own army.” He stripped his general of authority, sowed doubt among his soldiers, and handed a strategic victory to a superior enemy, proving that the greatest threat to an army is often not the enemy in front of it, but poor leadership from behind.

夫將者，國之輔也，輔周則國必強，輔隙則國必弱。故軍之所以患于君者三：不知三軍之不可以進，而謂之進；不知三軍之不可以退，而謂之退；是謂縻軍。不知三軍之事，而同三軍之政，則軍士惑矣。不知三軍之權，而同三軍之任，則軍士疑矣。三軍既惑且疑，則諸侯之難至矣，是謂亂軍引勝。