Gan Mao

Biography

Humble Origins and Rise in Qin

Gan Mao was born among common laborers in Xiacai, Chu (modern Yingshang, Anhui Province). Endowed with extraordinary ambition and analytical intellect, he studied the doctrines of the Hundred Schools under Master Shi Ju, an eccentric scholar who served as a town gatekeeper in Xiacai. Though Shi Ju lived in poverty and disregarded conventional etiquette, his mastery of statecraft and military strategy was profound. Gan Mao served him with exemplary filial piety, assimilating his strategic insights. Recognizing that the six eastern states were paralyzed by rigid traditions while Qin, transformed by the reforms of Shang Yang, rewarded talent without regard to birth, Gan Mao traveled west to Xianyang. In Qin, Gan Mao forged friendships with Prime Minister Zhang Yi and royal prince Chu Lizi. Both statesmen recognized his remarkable talent and introduced him to King Huiwen of Qin. King Huiwen was deeply impressed by Gan Mao's grasp of geopolitics, commissioning him as a field commander. In 312 BC, during the fierce campaigns against Chu, Gan Mao served as deputy to general Wei Zhang, securing the vast territories of Hanzhong and establishing Hanzhong Commandery, connecting the Guanzhong plains with the Sichuan basin. ### Pacifying Shu and Dual Premiership In 311 BC, King Huiwen died and his martial son, King Wu of Qin, ascended the throne. Disliking Zhang Yi's rhetorical diplomacy, the new court sidelined foreign persuaders, prompting Zhang Yi and Wei Zhang to depart for Wei. Simultaneously, rebellion erupted in the newly conquered territory of Shu. Marquis Hui of Shu and Minister Chen Zhuang rose in armed revolt, attempting to sever communication across the mountain passes. Recognizing Gan Mao's tactical ingenuity and familiarity with the southwest, King Wu entrusted him with the supreme command of the punitive expedition. Gan Mao led the Qin columns across the treacherous Qinling defiles, swiftly crushing the rebel armies, executing Marquis Hui and Chen Zhuang, and stabilizing the southwestern agricultural breadbasket. Returning victorious to Xianyang, Gan Mao earned the boundless trust of the young sovereign. In 310 BC, King Wu established the Dual Chancellorship system, appointing the imperial uncle Chu Lizi as Right Chancellor and elevating Gan Mao to Left Chancellor. Chu Lizi managed domestic administration while Gan Mao oversaw grand strategy and military expeditions, bringing Qin's geopolitical power to new heights. ### The Covenant of Xirang and the Fall of Yiyang King Wu possessed immense physical strength and harbored an overriding ambition to dominate the Central Plains. In 308 BC, the King privately confessed to Gan Mao: "It is my lifelong desire to ride in a curtained carriage through the Sanchuan corridor to view the royal capital of Zhou! If I can gaze upon the Nine Cauldrons, I can die without regret!" Discerning that the royal Zhou capital was blocked by the heavily fortified Korean bastion of Yiyang, Gan Mao replied: "Allow me to travel to Wei to forge an alliance against Han, and dispatch your intimate favorite Xiang Shou to accompany me." King Wu consented. Arriving in Daliang, Gan Mao successfully negotiated a military pact with King Xiang of Wei. However, he immediately instructed Xiang Shou to return to Xianyang with a startling message: "Tell His Majesty that Wei has consented to the alliance, but I beg him not to attack Han just yet." King Wu was bewildered and hastened to the frontier outpost of Xirang to receive Gan Mao. At Xirang, Gan Mao delivered one of the most famous strategic discourses in Chinese antiquity: "Yiyang is nominally a county, but in reality a heavily fortified commandery stocked with decades of grain from Shangdang and Nanyang. If Your Majesty campaigns a thousand li beyond our mountain passes to assault it, victory will be agonizingly difficult. In ancient times, when Zeng Shen lived in Fei, a man with the identical name committed murder. A neighbor told his mother: 'Zeng Shen has killed someone!' His mother continued weaving calmly. Soon, a second person arrived: 'Zeng Shen has killed someone!' His mother still worked her loom. But when a third messenger shouted the same news, his mother dropped her shuttle, vaulted the courtyard wall, and fled in terror! If a mother's unshakable faith in her virtuous son can be shattered by three voices of doubt, how can my virtue match Zeng Shen, and how can Your Majesty's trust match a mother's devotion? Those who envy and slander me at court number far more than three! I fear that when the siege drags on, Your Majesty will drop the shuttle and vault the wall! When Zhang Yi annexed Shu and extended our borders, the world praised the sovereign rather than the minister. When Marquis Wen of Wei dispatched Yue Yang to conquer Zhongshan, it took three years of brutal siege; upon returning, the Marquis presented him with a chest filled with letters of slander from his own courtiers, causing Yue Yang to prostrate himself and confess that victory was entirely due to his sovereign's fortitude. I am an alien guest-minister from Chu. Senior princes like Chu Lizi and Gongsun Shi will surely point to Han's formidable strength to oppose this campaign. If Your Majesty wavers and recalls the army, Qin will have broken faith with Wei, while I shall bear the eternal hatred of Han minister Gongzhong Chi!" Moved by his candor, King Wu declared: "I shall not listen to slander; I swear an oath with you!" On the stones of Xirang, sovereign and minister entered into the sacred "Covenant of Xirang," swearing to persevere until Yiyang fell. Gan Mao mobilized fifty thousand troops and laid siege to Yiyang. The Korean garrison fought with ferocious tenacity; after five months of relentless assaults, the ramparts remained intact. At court, Chu Lizi and Gongsun Shi launched a storm of criticism, pointing to catastrophic casualties and mounting financial ruin. King Wu wavered and dispatched a messenger ordering an immediate withdrawal. Confronting the royal envoy, Gan Mao uttered four immortal words: "Xirang is over there!" (!) Informed of this rebuke, King Wu blushed with shame, acknowledging the oath. He mobilized the kingdom's entire strategic reserves, dispatching them to the frontline. Galvanized by the sovereign's commitment, Gan Mao beat the war drums and spearheaded the final assault, storming Yiyang, decapitating 60,000 Korean troops, and taking Wusui. King Xiang of Han sent his Prime Minister to sue for peace, clearing the path for Qin's eastward expansion. ### Defending the Alliance and the Relief of Yongshi King Wu fulfilled his ambition of entering the Zhou capital at Luoyang. However, tragedy struck when he attempted to lift the colossal "Dragon Ding" in the Zhou ancestral temple, breaking his shins and dying that very night. In the ensuing succession crisis, Prince Ji was recalled from hostage status in Yan and enthroned as King Zhaoxiang of Qin, with his mother Queen Dowager Xuan assuming regent authority and her brother Wei Ran grasping military power. Seizing upon Qin's internal transition, King Huai of Chu mobilized massive forces to besiege the Korean city of Yongshi for five months to avenge past grievances. Korean minister Gongzhong Chi pleaded desperately for Qin intervention. However, Queen Dowager Xuan, a Chu native, refused to deploy troops. Desperate, Gongzhong Chi turned to Gan Mao. Gan Mao strode into the royal audience, arguing with impeccable strategic logic: "Han holds out only because it expects Qin's relief. If our army sits idle behind the mountain passes, Han will collapse and align south with Chu. Once Chu and Han unite, Wei will have no choice but to follow. A three-state coalition will then knock at the gates of Hangu Pass! Would Your Majesty rather sit waiting to be invaded, or take the offensive to establish supremacy?" King Zhaoxiang was swayed and ordered the army down the mountains. Learning of the Qin advance, the Chu forces broke camp and retreated. Gan Mao had once again averted a lethal anti-Qin coalition. ### Factional Persecution and Flight to Qi The rise of Queen Dowager Xuan's maternal clan spelled doom for non-royal guest ministers. Xiang Shou, an imperial favorite since boyhood, was placed in command of Yiyang, while Gan Mao campaigned against Wei at Puban. Diplomat Su Dai manipulated these internal rifts. When Gan Mao proposed returning Wusui to Han to consolidate the northern alliance, Xiang Shou and Gongsun Shi seized the opportunity to accuse Gan Mao of high treason and appeasement. Recognizing that the Queen Dowager's faction was bent on his destruction, Gan Mao knew that the "mother dropping the shuttle" was occurring once again. Remembering Shang Yang's fate, Gan Mao abandoned his command at Puban under cover of night and fled Qin. On the highway to Qi, Gan Mao encountered Su Dai, who was traveling as an ambassador to Qin. Gan Mao appealed to him with the famous parable of the poor girl spinning hemp: "I have been driven from Qin by slander and have no place of refuge. When a poor girl spins hemp alongside a rich girl, she asks: 'I cannot afford a candle, but your light has surplus; share a beam with me, which harms your brilliance none while lighting my work!' Now I am destitute, while you hold authority on your mission to Qin. My family remains in Xianyang; I beg you to spare a beam of your surplus light to preserve them!" Su Dai agreed. Reaching Xianyang, Su Dai warned King Zhaoxiang: "Gan Mao is an extraordinary strategist who knows every mountain pass and secret defile from the Qinling to Guigu! If he joins Qi, Han, and Wei against Qin, disaster will follow. Your Majesty should offer him high honors and a chancellor's seal to lure him back, and then confine him safely at Guigu for life!" King Zhaoxiang dispatched envoys bearing the chancellor's seal to Qi. Discerning the trap, Gan Mao refused. Su Dai then praised Gan Mao's integrity before King Min of Qi, who elevated Gan Mao to Senior Grandee. To prevent Gan Mao from turning hostile, King Zhaoxiang exempted his entire family in Xianyang from all taxes and corvée labor, ensuring their survival. ### Final Years and Historical Impact Serving as Senior Grandee in Qi, Gan Mao was dispatched on an embassy to Chu. King Huai of Chu, recently reconciled with Qin, contemplated recommending Gan Mao to serve as Prime Minister of Qin. However, Chu counselor Fan Juan cautioned King Huai: "Master Shi Ju was an obscure gatekeeper in Xiacai, yet Gan Mao served him with absolute obedience. With the brilliance of King Huiwen, the discernment of King Wu, and the eloquence of Zhang Yi, Gan Mao served all three across ten offices without a single blemish! Gan Mao is indeed a supreme sage, but he must never be allowed to govern Qin! A capable chancellor in Qin is a calamity for Chu! If Your Majesty wishes to sponsor a chancellor for Qin, recommend Xiang Shou instead! Xiang Shou is an imperial relative who shared clothes and carriages with the King in childhood; he lacks strategic genius. With Xiang Shou as Chancellor, Qin will fall into decay, securing Chu's advantage!" King Huai heeded the advice and sponsored Xiang Shou, who was duly appointed Chancellor of Qin. Realizing that his political career in Qin was permanently ended, Gan Mao moved to Wei, where he died in exile. His legacy was revived decades later by his brilliant grandson, Gan Luo, who won five cities from Zhao and was created Senior Grandee of Qin at the age of twelve. Birthplace clarification: the Any such birthplace assertion retained in the existing narrative remains unconfirmed.

Major Activities

1. Pacification of Hanzhong and Shu

Serving as a trusted military commander under Kings Huiwen and Wu, Gan Mao played an indispensable role in securing Qin's southern empire. He acted as deputy commander during the conquest of Hanzhong, integrating the region into Qin's administrative network, and subsequently led the punitive expedition across the Qinling to crush the separatist rebellion of Marquis Hui of Shu, securing Qin's primary logistical breadbasket. ### 2. The Covenant of Xirang and the Capture of Yiyang Recognizing that prolonged siege warfare inevitably invited domestic political slander, Gan Mao forged the historic "Covenant of Xirang" with King Wu in 308 BC, invoking the historical lessons of Zeng Shen and Yue Yang. Despite fierce court opposition, he held the sovereign to his sacred oath, capturing the fortress of Yiyang, claiming 60,000 enemy heads, and opening the Sanchuan gateway to the Central Plains. ### 3. Diplomatic and Military Relief of Yongshi In 306 BC, when Queen Dowager Xuan refused to assist Han during the Chu siege of Yongshi, Gan Mao intervened with brilliant strategic persuasion, demonstrating that an abandoned Han would coalesce with Chu and Wei into a fatal anti-Qin coalition, successfully prompting Qin military intervention and preserving the northern alliance. ### 4. Preserving His Family across Warring States Confronting lethal political intrigue from Qin's ruling maternal faction, Gan Mao orchestrated a masterclass in strategic retreat. Leveraging diplomat Su Dai and the parable of "borrowing surplus candlelight," he secured asylum as Senior Grandee in Qi while compelling Qin to grant his family in Xianyang complete tax and legal immunity, preserving his lineage to produce prodigy chancellor Gan Luo.

Personal Relations

• Master / Mentor: Shi Ju (town gatekeeper of Xiacai, master of Hundred Schools philosophies)
• Early Sponsors: Zhang Yi (Chancellor of Qin), Chu Lizi (Prince and Right Chancellor of Qin)
• Sovereigns: King Huiwen of Qin, King Wu of Qin (close ally in the Covenant of Xirang), King Zhaoxiang of Qin, King Min of Qi
• Diplomatic Allies: Su Dai (renowned Warring States strategist), Gongzhong Chi (Chancellor of Han)
• Political Adversaries: Xiang Shou (nephew of Queen Dowager Xuan), Gongsun Shi (Qin courtier), Wei Ran (Marquis of Rang)
• Direct Descendants: Gan Luo (grandson, boy chancellor of Qin), Gan Ning (general of Eastern Wu), Gan Zhuo (general of Eastern Jin)

Historical Assessment

Contemporary and Ancient Historians

• Su Dai: "Gan Mao is an extraordinary strategist who knows every mountain pass and secret defile from the Qinling to Guigu."
• Fan Juan: "Gan Mao served Master Shi Ju with absolute obedience. With the brilliance of King Huiwen, the discernment of King Wu, and the eloquence of Zhang Yi, Gan Mao served all three across ten offices without a single blemish! Gan Mao is indeed a supreme sage, but he must never be allowed to govern Qin, for a capable chancellor in Qin is a calamity for Chu!"
• *Sima Qian (Records of the Grand Historian)*: "Chu Lizi was revered as royal kin, yet the people of Qin admired his wisdom. Gan Mao arose from the humble alleys of Xiacai, achieving renown among the feudal lords and commanding the respect of Qi and Chu... The strategic counsel of Chu Lizi and Gan Mao was the very instrument by which Qin expanded east and dominated the feudal lords."
• *Sima Zhen (Shi Ji Suoyin)*: "Gan Mao served as joint chancellor, first assisting Wei Zhang. He promoted Xiang Shou and stormed Yiyang. Bound by the oath of Xirang, he gave up not Wusui. Respected by Gongzhong Chi and valued by Fan Juan, he fled to Qi as an acknowledged sage." ### Modern Historiographical Perspectives
• *Liu Xiang (Stratagems of the Warring States)*: Liu Xiang highlighted Gan Mao as a consummate exemplar of the Warring States political strategist, whose ability to navigate sovereign mistrust through the Covenant of Xirang remains one of the greatest strategic masterpieces in Chinese political history.
• Modern Strategic Studies: Modern scholars emphasize that Gan Mao's capture of Yiyang transformed Qin's grand strategy from regional defense into irreversible eastward hegemony, while the "Covenant of Xirang" established a classic paradigm in civil-military relations concerning battlefield autonomy versus sovereign interference.