Biography
Early life
Deng Ai was born in 195 CE in Jiyang, Yiyang Commandery (present-day Xinye, Henan). His family had once been a prominent clan in Nanyang and Xinye, but by Deng Ai’s time, his family background could no longer be clearly traced.
Deng Ai lost his father at a young age and lived in poverty. He lived during a time of frequent warfare and social upheaval, in a region where land was highly concentrated and powerful families engaged in fierce competition.
However, Deng Ai received a good education from childhood, which had a major impact on his life.
Migration to Runan
In 208 CE, after Cao Cao captured Jing Province, he forcibly relocated the local people north. Deng Ai, together with his mother and clan members, were forcibly moved to Runan (present-day Shangcai, Henan) to become agricultural colonists.
Because he was young, Deng Ai initially worked as a cowherd. But he had great ambitions from childhood and was determined to change his fate through struggle.
At age twelve, he moved with his mother to Yingchuan, where he read the stele inscription of the late Grand Administrator of Taichiu, Chen Shi. The inscription contained the phrases “文為世範，行為士則” (literature as a model for the world, conduct as a standard for scholars). Deng Ai was inspired and named himself Deng Fan, courtesy name Shize.
Later, when a clan member had the same name, he changed it to Deng Ai.
Early career
Among the agricultural colonists, few had talent and learning. Deng Ai, relying on his talent and learning, was recommended as a Student of Commandant of Agricultural Colonies, which allowed him to serve as a subordinate official to the Commandant of Agricultural Colonies. If he had achievements, he could gradually be promoted. For someone of humble birth, this was a path to advancement.
However, because he had a stutter, the Commandant of Agricultural Colonies considered him unsuitable for important positions and assigned him to serve as a Clerk Who Guards Rice Fields.
An elder from the same commandery saw that Deng Ai’s family was poor and often provided assistance, but Deng Ai initially did not express gratitude.
Deng Ai loved military affairs. Whenever he saw high mountains and great rivers, he would survey the terrain and point out where camps should be established. Others laughed at him, but he did not mind.
At that time, for agricultural colonists of humble birth to rise above others was very difficult. Deng Ai lived an ordinary life for nearly twenty years. Later, he finally became a Clerk for Agricultural Affairs, helping to manage agricultural colonies.
Meeting Sima Yi
Once, Deng Ai went to Luoyang to report and had the opportunity to meet Sima Yi, Grand Commandant of Luoyang. Sima Yi greatly appreciated his talent and summoned him to serve as a Clerk to the Grand Commandant, then promoted him to Gentleman of the Palace.
Meeting Sima Yi was a major turning point in Deng Ai’s life.
Agricultural and military planning
In the early Zhengshi period (240–249), Wei prepared to establish agricultural colonies in the southeast to accumulate military grain and deal with Wu. Deng Ai was sent to inspect the area.
Deng Ai inspected from Chen County (present-day Huaiyang, Henan) and Xiang County (present-day Shenqiu, Henan) all the way to Shouchun. After investigation, Deng Ai proposed two important suggestions:
First, to dig canals and build waterworks to irrigate farmland, increase per-unit yield, and open water transport.
Second, to implement large-scale military agricultural colonies in Huaibei and Huainan.
He believed: “The land is fertile, but unfortunately there is little water, so the land cannot be fully utilised. We should dig canals, draw water for irrigation, accumulate military grain extensively, and open water transport routes.”
He wrote the “Discussion on Crossing the River” (濟河論) to explain his views.
Deng Ai also believed: “In the past, when we pacified the Yellow Turban rebellion, we established agricultural colonies for this purpose. We accumulated much grain in Xudu, aiming to control the realm. Now three sides are pacified, but there is still warfare south of the Huai River. Whenever the great army campaigns south, the troops used for transport alone account for half, consuming great resources and requiring heavy labour.
“Between Chen and Cai, the land is fertile. We can reduce the rice fields around Xuchang and draw water east. Now we can station twenty thousand troops in Huaibei and thirty thousand in Huainan, rotating one-fifth for rest, always having forty thousand, farming while defending.
“When the weather is favourable, the harvest is often more than three times that of the west. After deducting the expenses of troops and people, we can use five million hu annually as military supplies. In six or seven years, we can accumulate thirty million hu in the upper reaches of the Huai River. This grain is enough for one hundred thousand troops and people to eat for five years. With these supplies, we can attack Wu and be invincible.”
Sima Yi was very satisfied and adopted and implemented the plan. From 241 CE, Wei extensively dug canals in Huainan and Huaibei and established large-scale agricultural colonies. North of the Huai River, from Zhongli south, west of Hengshi, to the source of the Bi River, over four hundred li of land, a military agricultural camp was established every five li. Each camp had sixty people, farming while defending.
At the same time, the Huaiyang and Baichi canals were widened, drawing water from the Yellow River into the Huai and Ying Rivers. Many paddy fields were built south and north of the Ying River. Over three hundred li of canals were dug in the Huai River basin, irrigating twenty thousand qing of farmland, connecting Huainan and Huaibei.
A few years later, from the capital to Shouchun, military agricultural colonies were visible along the way, and the sounds of chickens and dogs could be heard, showing prosperity and wealth.
From then on, waterworks and military agricultural colonies in the Huai River basin developed rapidly, and Wei’s defensive strength in the southeast was greatly enhanced. Whenever there was warfare in the southeast, the great army could sail down by boat directly to the Jianghuai region. Military supplies and grain were stored, and there were no water disasters. All of this was Deng Ai’s achievement.
Early military service
In 243 CE, Deng Ai was appointed to participate in military affairs of the campaign against the west and transferred to Administrator of Nan’an (present-day Longxi southeast, Gansu).
Battle of Qucheng
In the autumn of 249 CE, Jiang Wei, General Who Guards the Army of Shu Han, led troops to attack Yong Province (present-day Guanzhong, Shaanxi, and eastern Gansu), building two cities near Qushan (present-day Min County, one hundred li east, Gansu). Jiang Wei was familiar with the customs and conditions of Longxi and wanted to lure the Qiang and Hu to submit to Shu to control the region.
Sima Zhao, General Who Pacifies the West with Credentials, served as commander of all armies. Deng Ai also participated in this campaign.
Guo Huai, General Who Conquers the West, and Chen Tai, Inspector of Yong Province, led troops to resist. Chen Tai believed: “Qucheng is strong, but it is far from Shu, the roads are dangerous, and grain can only be transported over long distances. The Qiang and Hu hostages fear serving Jiang Wei and will certainly not cooperate for long. If we besiege and attack it, we can take Qucheng without bloodshed. Although Shu may send reinforcements, the mountain roads are dangerous and will not arrive quickly.”
Guo Huai followed his plan and adopted a strategy of besieging the city and attacking reinforcements. He ordered Chen Tai, together with Xu Zhi, General Who Attacks Shu and Protects the Army, and Deng Ai, to besiege Qucheng, cutting off communications and water sources. The Shu forces in Qucheng were in dire straits.
Jiang Wei led troops to rescue, advancing to Niutoushan (southeast of Min County, Gansu, south bank of the Tao River), where he was blocked by Chen Tai’s forces. Sima Zhao marched out of Luogu toward Hanzhong, and Guo Huai led troops to press the Tao River, attempting to cut off Jiang Wei’s retreat. Jiang Wei quickly withdrew.
Ju An, Li Xin, and others, isolated and without support, surrendered the city.
Guo Huai then led troops west to attack the various Qiang tribes. Deng Ai said: “The enemy has not withdrawn far—they may quickly counterattack. We should divide our forces to avoid accidents.”
Guo Huai left Deng Ai to station at Baishui (present-day Bailong River, Gansu) north bank to guard against a Shu counterattack.
Three days later, Shu forces indeed returned. Jiang Wei sent Liao Hua to camp at Baishui south bank, facing Deng Ai from afar, but did not attack Wei.
Deng Ai said to his generals: “Jiang Wei suddenly returned. Our forces are few. According to reason, they should cross the river and need not build a bridge. This is Jiang Wei wanting Liao Hua to contain our forces so we cannot move. Jiang Wei will certainly attack Taocheng from the east.”
Taocheng (present-day Lintan southwest, Gansu) was north of Baishui, sixty li from Deng Ai’s position. Deng Ai occupied Taocheng that night. Soon after, Jiang Wei indeed led heavy forces to attack Taocheng. When Jiang Wei saw that Wei forces had already occupied Taocheng, he withdrew and retreated. Wei forces were thus not defeated.
Rewards and promotions
Deng Ai was enfeoffed as Marquis within the Passes for this achievement and promoted to General Who Attacks Bandits. Later, he was transferred to Administrator of Chengyang (seat present-day Zhucheng northeast).
Advice on Xiongnu
At that time, Liu Bao, Right Worthy King of Bing Province, united the Xiongnu into one tribe. Deng Ai submitted a memorial saying: “The Rong and Di have the hearts of wild beasts and do not speak of righteousness. When they become strong, they commit violence; when they weaken, they submit to the court. Because of this, during King Xuan of Zhou, the Rong and Di invaded south, approaching the Zhou capital. In the early Han, Emperor Gao was surrounded by Modu Chanyu’s four hundred thousand troops at Baideng southeast of Ping.
“Whenever the Xiongnu were strong, previous dynasties all considered this the greatest worry. When the chanyu lived far beyond the frontier, the court could not directly control the Xiongnu chanyu and his subordinates. We induced the chanyu to come and made him submit, thus causing the Qiang and Yi to lose their leader and be without a head. Because the chanyu lived in the interior, the various Hu tribes around were pacified.
“Now, although the Southern Chanyu remains in the capital, he is increasingly estranged from his subordinates. At the same time, Right Worthy King Liu Bao lives beyond the frontier, and his tribe’s strength is extremely powerful, posing a threat to the court. This is something we cannot fail to guard against.
“I hear that someone under Liu Bao has rebelled. We should take advantage of this to divide them into two states to weaken Liu Bao’s strength. In the early Jian’an period, Right Worthy King Qubei escorted Emperor Xian, resisted Li Jue and Guo Si, and the imperial carriage returned to Luoyang, then he returned to his state. His achievements were quite prominent in previous generations. However, his descendants have not been able to inherit his legacy. We should grant him a prominent title and have them live in Yanmen, far from the state territory, to weaken the enemy situation and make them admire and seek to establish the achievements of their ancestors and serve the state. This is a long-term plan for defending the frontier.”
Deng Ai also said: “All Qiang and Hu who live together with Han people should gradually be separated, making them live outside the registered population, to honour the teaching of distinguishing between integrity and shame and block the path of those who commit crimes and cause chaos.”
Sima Shi, Grand General, had just taken office to assist in government and adopted and implemented many of Deng Ai’s suggestions.
Administrator of Runan
Soon after, Deng Ai was transferred to Administrator of Runan. After taking office, he sought out the elder from the same commandery who had treated him well in the past. Unfortunately, the elder had died, so Deng Ai sent officials to offer sacrifices and gave generous rewards to his family.
Deng Ai promoted land reclamation and agricultural development wherever he went. The historical records say: “Wherever Deng Ai was, wilderness was opened up, and troops and people were both prosperous.” This shows he was very effective in this regard.
Predicting Zhuge Ke’s fall
In the second month of 253 CE, after Zhuge Ke, Grand Tutor of Wu, achieved victory at the Battle of Dongxing, he relied on his achievements and looked down on the enemy. Despite the remonstrance of his ministers, he again raised troops to attack Wei, besieging Hefei Xincheng (present-day Hefei northwest, Anhui) but failing to capture it and being forced to retreat.
Deng Ai said to Sima Shi: “Sun Quan has died, and the old ministers do not submit to the new court. The famous clans and great families of Wu all have their own local forces, relying on military power and authority, completely able to dominate a region.
“Zhuge Ke has just taken control of the government, and there is no ruler within the state who meets expectations. He does not consider how to pacify superiors and subordinates to stabilise the government but frequently uses force externally and mistreats his own people. With the entire state’s military strength, he attacked Hefei, this strong city. The dead numbered no less than tens of thousands, and he was greatly defeated and returned. This is Zhuge Ke’s day of self-destruction.
“In the past, Wu Zixu, Wu Qi, Shang Yang, and Yue Yi all received the trust of their respective state’s rulers. When the ruler died, their own end came. How much more so Zhuge Ke, whose talent is far from matching the four worthy men mentioned above? However, he does not carefully consider the hidden great danger. His self-destruction is not far off.”
Soon after, Zhuge Ke was indeed killed.
Inspector of Yan Province
Soon after, Deng Ai was transferred to Inspector of Yan Province and promoted to General Who Spreads Martial Might. He saw that some local officials did not value agricultural production and engaged only in socialising and seeking connections, with a flashy and impractical style. He submitted a memorial suggesting: “A state’s most urgent tasks are no more than two: agriculture and military preparation. When the state is wealthy, military preparation can be strong, and we can be invincible. Agriculture is the foundation of victory.
“Confucius said: ‘When grain is sufficient, military strength can be sufficient.’ The importance of grain is truly above military strength. If the court does not establish rewards to encourage, then the people below will not work hard to accumulate wealth. We should now establish rewards to encourage people to accumulate grain extensively. In this way, we can eliminate the practice of travelling around persuading and flashy but impractical trends.”
Suppressing Guanqiu Jian’s rebellion
In 254 CE, Cao Mao, Duke of Gaogui Township, ascended the throne. At this time, the situation of the Sima family replacing Wei became clear. The Sima family inherited important positions inside and outside the court, concentrating military and political power in themselves, arbitrarily carrying out depositions and installations, and slaughtering political enemies. Generals who attached themselves to the Cao Wei imperial family then raised troops in resistance one after another.
In 255 CE, in the first month, Guanqiu Jian, General Who Guards the East, and Wen Qin, Inspector of Yang Province, falsely claimed to have received an edict from Empress Dowager Guo and raised troops at Shouchun (present-day Shou County, Anhui), transmitting announcements to commanderies and counties to attack Sima Shi.
Deng Ai killed the messenger and advanced quickly, rushing ahead to Lecheng (present-day Shangshui, Henan) and building a floating bridge, so that when Sima Shi arrived, he could occupy Lecheng. Wen Qin, because he fell behind the great army, was defeated at the city. Deng Ai pursued Wen Qin to Qiutou. Wen Qin fled to Wu and submitted to Sun Jun, Chancellor of Wu.
Sun Jun and others took advantage of Wei’s internal chaos to lead troops numbering one hundred thousand and wanted to cross the river. Zhuge Dan, General Who Guards the East of Wei, sent Deng Ai to occupy Feiyang. Deng Ai believed Feiyang was too far from the enemy and not a critical location, so he moved to Futing and sent Zhuge Xu, Administrator of Taishan, and others to resist the enemy at Lijiang, driving them away.
That year, Deng Ai was appointed Colonel of Rapid as Tigers. Because of his achievements in defeating Wen Qin and others, he was enfeoffed as Marquis of Fangcheng Township and acted as General Who Pacifies the West.
Battle of Didao
In the seventh month of 255 CE, Jiang Wei, General Who Guards the Army of Shu Han, took advantage of Sima Shi’s death to lead tens of thousands of troops, including Xiahou Ba, General of Chariots and Cavalry, and Zhang Yi, General Who Conquers the West, to attack Wei. In the eighth month, they reached Fuhan (present-day Linxia northeast, Gansu) and advanced toward Didao (present-day Lintao, Gansu).
Chen Tai, General Who Conquers the West, ordered Wang Jing, Inspector of Yong Province, to lead his forces to advance to Didao and wait for him to lead the main force from Chencang (present-day Baoji east, Shaanxi) before pincer-attacking the Shu army.
Wang Jing did not wait for Chen Tai’s army to arrive but attacked the Shu army on his own, being defeated first at Guguan (present-day Lintao north, Gansu) and then at Taoxi. Most were killed or wounded or fled, and the remnants, ten thousand men, returned to defend Didao.
Jiang Wei took advantage of the victory to besiege Didao city.
”Cutting off the hand”
Sima Zhao, Grand General, ordered Deng Ai to serve as General Who Pacifies the West with Credentials and resist the Shu army together with Chen Tai, and sent Sima Fu, Grand Commandant, as reinforcements.
At this time, Deng Ai and others believed: “Wang Jing’s elite troops were defeated in the west. The enemy’s morale is very high. A victorious army cannot be resisted. The general leads a motley force, following behind a defeated army. The officers and soldiers have lost their fighting spirit, and Longyou is unstable.
“The ancients had this saying: ‘If a viper bites the hand, a strong man cuts off his wrist.’ Sun Tzu’s Art of War says: ‘Sometimes armies do not attack, sometimes places are not defended.’ This is because of small losses to preserve the greater whole.
“Now the disaster in Longyou is more severe than a viper. Didao is not just a place that cannot be defended. Jiang Wei’s army—this is the sharp edge we should avoid. We should divide and defend the strategic positions, observe the enemy’s weaknesses, wait for the enemy to become exhausted, then advance to rescue. This is the strategy for victory.”
However, Chen Tai said: “Military books say: ‘Repairing large shields and siege vehicles takes three months to complete. Building earth mounds takes three months after that.’ This is truly not something that can be done hastily with light troops advancing deep or by Jiang Wei’s schemes.
“Jiang Wei leads a lone army advancing deep, and grain supplies cannot keep up. This is the opportunity for us to quickly advance and defeat the enemy. The so-called ‘swift thunder that cannot cover the ears’ is the inevitable situation.”
Finally, Chen Tai rejected Deng Ai’s suggestion to abandon Didao and seek stability. The three Wei armies joined together to prepare to relieve the siege of Didao.
Jiang Wei led troops to attack along the mountain and was repulsed by Wei forces. Chen Tai spread word that he would cut off the Shu army’s retreat. The Shu army was terrified and withdrew to Zhongdi (present-day Lintao south, Gansu) on the twenty-fifth day of the ninth month. The siege of Didao was thus relieved.
The court then appointed Deng Ai as General Who Pacifies the West with Credentials and acting Protector of the Eastern Qiang Colonel.
Predicting Jiang Wei’s return
At this time, most Wei officers believed Jiang Wei was exhausted and could not again campaign north. Deng Ai did not think so. He pointed out: “The defeat at Taoxi was not small. Military morale collapsed, granaries were empty, and the common people were displaced—almost a complete defeat.
“Now, looking at it, the enemy has the momentum to take advantage of victory and pursue. Our side is weak and exhausted. This is the first reason.
“The enemy’s officers and soldiers are connected at all levels, and their weapons are sharp. Our side has changed generals, and most soldiers are newly replenished. Weapons and equipment are all old. This is the second reason.
“The enemy travels by boat, and we travel on foot. The enemy is at ease, and we are tired. This is the third reason.
“Didao, Longxi, Nan’an, and Qishan each need defensive forces. They concentrate on attacking one city, and our side is divided into four. This is the fourth reason.
“From Nan’an and Longxi, we need to requisition grain from the Qiang. If they advance toward Qishan, the wheat waves stretch for a thousand li, and grain is easily obtained. This is the fifth reason.
“The enemy also has cunning schemes. They will certainly come to attack.”
After analysing the above situation, he asserted that Jiang Wei would still wait for an opportunity to invade and stepped up preparations.
Battle of Duangu
In 256 CE, in the sixth month, Jiang Wei, Grand General of Shu Han, agreed with Hu Ji, General Who Guards the West, to meet at Shanggui (present-day Tianshui, Gansu). Jiang Wei led troops first to Qishan (present-day southeastern Gansu mountains). Hearing that Deng Ai was prepared, he changed course and attacked Nan’an (present-day Longxi southeast, Gansu) from Dongting (present-day Wushan south, Gansu).
Deng Ai then led troops to occupy Wuchengshan (present-day Wushan southwest, Gansu) and defended it, facing Jiang Wei.
Jiang Wei saw that the terrain advantage was lost and a strong attack would be difficult to succeed, so that night he crossed the Wei River east and advanced along the mountain road toward Shanggui.
The two armies fought at Duangu (present-day Tianshui southwest, Gansu). Hu Ji failed to arrive on time. Deng Ai greatly defeated the Shu army. Shu soldiers scattered, and casualties were very heavy.
Jiang Wei returned defeated and requested to be demoted to General of the Rear.
In this battle, Deng Ai accurately predicted the enemy before the battle and adapted to circumstances during the battle, always maintaining the initiative in the campaign. This left valuable experience for defensive operations in later generations.
That year, Cao Mao issued an edict praising Deng Ai and appointed him General Who Guards the West and Commander of Longyou, enfeoffing him as Marquis of Deng. Five hundred households were divided, and his son Deng Zhong was enfeoffed as Marquis within the Passes.
Campaign against Zhuge Dan
In the fifth month of 257 CE, Zhuge Dan, a Wei general, joined with Eastern Wu to raise troops in rebellion against Sima Zhao in Huainan. Sima Zhao transferred forces from Guanzhong east to attack Zhuge Dan.
Jiang Wei, Grand General of Shu, took the opportunity to attack Wei’s Qinchuan (Wei River basin). In the twelfth month, Jiang Wei led tens of thousands of troops out of Luogu (present-day Zhouzhi southwest, Shaanxi) and reached Shenling (present-day Zhouzhi south, Shaanxi).
At that time, Wei had stored large amounts of military grain at Changcheng (present-day Zhouzhi south, Shaanxi), but the defence was weak. Deng Ai (then General Who Pacifies the West) and Sima Wang, General Who Conquers the West, feared Jiang Wei would attack and seize Changcheng and immediately joined forces to defend it.
Jiang Wei’s army advanced to Mangshui (present-day Zhouzhi Heishui, Shaanxi) and camped against the mountain. Deng Ai and Sima Wang led troops to build a camp near the water.
The Shu army challenged many times, but Deng Ai and Sima Wang held firm and did not go out. The two armies faced each other for a long time.
In the third and fourth months of the following year (258), Jiang Wei heard that Zhuge Dan had been defeated and died and had no choice but to lead his army and return.
Deng Ai was promoted to General Who Conquers the West for this achievement, and his fief was increased by a total of six thousand six hundred households.
Battle of Houhe
In the tenth month of 262 CE, Jiang Wei, Grand General of Shu Han, again raised troops to attack Wei and entered the territory of Taoyang.
Deng Ai led troops to meet the attack. Deng Ai analysed that Jiang Wei led a lone army on a distant campaign, with a long supply line and difficult supply, making it difficult to sustain for long. He occupied advantageous terrain and set up a formation at Houhe (present-day Zhuoni northeast) east of Taoyang, waiting at ease for the tired enemy and blocking the Shu army.
After both sides fought fiercely, the Wei army launched a counterattack. The Shu army was defeated and fled, suffering serious losses. Jiang Wei retreated to Tazhong (present-day Zhouqu northwest, Gansu).
The conquest of Shu
In the same year, Sima Zhao, Grand General, who controlled the court, formulated a strategy to first destroy Shu, then follow the river to destroy Wu. He appointed Zhong Hui, Colonel Director of Retainers, as General Who Guards the West and sent him to Guanzhong to prepare for war.
In the summer of 263 CE, Sima Zhao proposed the strategy of attacking Shu to the assembly. Deng Ai believed the time to attack Shu had not yet come and repeatedly submitted memorials to remonstrate.
Sima Zhao was very worried about this and ordered Shi Zuan, Chief Clerk, to serve as Deng Ai’s Marshal to persuade Deng Ai. Deng Ai then accepted the order.
The three-pronged attack
In the eighth month, Wei forces attacked Shu in three columns:
-
Deng Ai, General Who Conquers the West, led over thirty thousand troops, advancing from Didao (present-day Lintao, Gansu) to contain Jiang Wei, Grand General of Shu, who was stationed at Tazhong (present-day Zhouqu northwest, Gansu).
-
Zhuge Xu, Inspector of Yong Province, led over thirty thousand troops to attack Wudu (present-day Cheng County northwest, Gansu) to cut off Jiang Wei’s retreat.
-
Zhong Hui led the main force of over one hundred thousand troops, wanting to take Hanzhong by surprise, then advance directly to Chengdu.
Wei Guan, Commandant of the Court of Justice, served as Marshal of the Army Who Guards the West, with credentials supervising Deng Ai and Zhong Hui’s military affairs.
The Grand General Sima Zhao unified command and control.
The Yinping crossing
Shu forces sent Liao Hua, Right General of Chariots and Cavalry, to lead troops to Tazhong to reinforce Jiang Wei. Zhang Yi, Left General of Chariots and Cavalry, and others went to Yang’an Pass to resist.
They ordered the various generals in Hanzhong to abandon the outer positions of Hanzhong and concentrate forces to retreat and defend Hancheng (present-day Mian County east, Shaanxi) and Lecheng.
Because Shu forces did not strictly defend the strategic passes of Xiegu, Luogu, and Ziwugu, they were occupied by Liu Qin, Administrator of Weixing of Wei. Zhong Hui then advanced in several columns, directly entering Hanzhong, leaving twenty thousand troops to besiege Han and Le cities, and personally leading the main force directly down to Yang’an Pass.
He killed Fu Qian, a Shu general, and accepted the surrender of Jiang Shu, then captured Guancheng (present-day Yangping Pass, Shaanxi) and advanced south unopposed.
The daring crossing
Deng Ai ordered Wang Qi, Administrator of Tianshui, to directly attack Jiang Wei’s camp, ordered Qian Hong, Administrator of Longxi, and others to intercept Jiang Wei’s vanguard, and ordered Yang Xin, Administrator of Jincheng, to attack Gansong.
When Jiang Wei heard that Zhong Hui and others had entered Hanzhong, he knew Hanzhong was difficult to defend and quickly broke away from Deng Ai and retreated to Yinping.
Yang Xin and others pursued until Jiangchuan Pass, where both sides fought a great battle. Jiang Wei was defeated and retreated. He was blocked by Zhuge Xu, who had occupied Qiaotou (southeast of Yinping) first.
Jiang Wei feigned from Konghangu to the north, wanting to go around to the east, making a show of attacking Zhuge Xu’s rear to induce Zhuge Xu to leave Qiaotou thirty li north to block. Jiang Wei took the opportunity to quickly pass through Qiaotou and joined forces with Liao Hua, Zhang Yi, and others to defend Jiange.
Zhuge Xu went to block but was one day late and did not catch up.
Deng Ai advanced to Yinping and wanted to join forces with Zhuge Xu to advance south. Zhuge Xu did not follow and led troops east to join Zhong Hui.
Zhong Hui wanted to monopolise military authority and falsely accused Zhuge Xu of fearing the enemy and not advancing. He had him taken back to be punished, then personally led the great army south but was blocked by Jiang Wei at Jiange.
Jiange had the reputation of “one man can hold the pass against ten thousand.” Jiang Wei defended it by relying on the terrain. Zhong Hui attacked Jiange but could not capture it and had no plan.
At that time, Wei forces were running out of military grain, and Zhong Hui prepared to withdraw.
The proposal
Deng Ai submitted a memorial saying: “Now the enemy has suffered great setbacks. We should take advantage of the victory to pursue. From Yinping, follow the small road, pass through Handeyang Pavilion, and head toward Fu County. It is over one hundred li west of Jiange and three hundred li from Chengdu. Send elite troops to directly attack the enemy’s heart.
“Jiang Wei, although he defends Jiange, in this situation, he will certainly have to lead troops to rescue Fu County. At this time, Zhong Hui can take advantage of the opportunity to advance. If Jiang Wei defends Jiange and does not rescue Fu County, then Fu County has very few troops.
“Military strategy says: ‘Attack where they are not prepared, emerge where they do not expect.’ Now we attack their empty place and will certainly defeat the enemy.”
The crossing
In the tenth month, Deng Ai took advantage of Jiang Wei being contained at Jiange by Zhong Hui and led troops from Yinping along the Jinggu Road, turning east and then south, emerging over two hundred li south of Jiange. Zhong Hui also sent Tian Zhang, a subordinate general, to follow.
Deng Ai led troops to climb the small road, chiselling through mountains and opening roads, building plank roads and bridges, advancing in single file through over seven hundred li of uninhabited dangerous terrain.
The mountains were high and the valleys deep, extremely dangerous. Along the way, grain transport could not keep up, and they were in dire straits many times.
When the troops reached Mageshan, the road was cut off, and for a time they could neither advance nor retreat. Deng Ai personally led by example and wrapped himself in felt to roll down the slope.
Deng Ai led troops to unexpectedly reach Jiangyou. Ma Miao, the defending general, surrendered to Deng Ai.
Battle of Mianzhu
Zhuge Zhan, General Who Guards the Army of Shu Han (son of Zhuge Liang), led the various armies to stop at Fucheng. After the vanguard was defeated, he retreated and camped at Mianzhu, forming up to wait for Deng Ai.
Deng Ai sent his son Deng Zhong to attack Zhuge Zhan’s right wing and Shi Zuan, Marshal, to attack his left wing. Deng Zhong and Shi Zuan were defeated and retreated, saying to Deng Ai: “The enemy defends firmly—it is difficult to break through.”
Deng Ai was furious and said: “At this moment of life and death, everything depends on this one action. What do you mean by ‘can’ or ‘cannot’?” He loudly rebuked the two generals and wanted to execute them.
The two generals galloped back on their horses and led troops to fight again. Deng Ai also personally supervised the battle. Finally, he greatly defeated the Shu army, killing Zhuge Zhan, General of Shu, and Zhang Zun, Director of the Imperial Secretariat, Huang Chong, Gentleman of the Imperial Secretariat, Li Qiu, Colonel of the Rapid as Tigers, and Zhuge Shang, son of Zhuge Zhan.
He sent Zhuge Zhan’s head to the capital.
The surrender
Initially, Shu Han believed the enemy would not attack immediately and did not make defensive arrangements. After hearing that Deng Ai had entered Yinping, the common people panicked and were in chaos, fleeing into the mountains and wilderness, and could not be controlled.
After the Battle of Mianzhu, Deng Ai’s prestige shook the western lands. The Shu army collapsed completely. The various county magistrates either surrendered at the sight of his forces or abandoned their offices and fled. Only Chang Xu, Magistrate of Pi, led officials and people to firmly defend the city.
Deng Ai took advantage of the victory to attack, advancing in one breath to Luoxian (present-day Guanghan north, Sichuan), approaching Chengdu.
Liu Shan, Later Ruler of Shu Han, was terrified and at a loss. Feeling that the situation was hopeless, under Qiao Zhou’s persuasion, he decided to surrender and sent Zhang Shao, Deng Liang, and Qiao Zhou with the imperial seals and credentials and a letter of surrender to Deng Ai to request surrender.
Zhang Shao and Deng Liang met Deng Ai at Luoxian. Deng Ai received the letter of surrender and was overjoyed. He immediately wrote a reply and had Zhang Shao and Deng Liang return to Chengdu first.
Deng Ai reached north of Chengdu city. Liu Shan rode in a mule cart, leading the crown prince, various kings, and over sixty ministers, binding himself and carrying a coffin to the camp to pay respects.
Deng Ai held credentials, untied the bindings, burned the coffin, accepted the surrender, and pardoned them. Deng Ai restrained his troops. After entering the city, there was no plundering. He pacified those who surrendered and had them resume their old occupations, winning the support of the Shu people.
The conspiracy
After achieving this great victory, Deng Ai, without authorisation, following the practice of Deng Yu, General of the Eastern Han, used the name of the Son of Heaven to appoint many officials. He appointed Liu Shan as acting General of Chariots and Cavalry, the Shu Han crown prince as Colonel of the Rapid as Tigers, and the various kings as Colonels of the Rapid as Tigers. For Shu Han ministers, according to their status, he either appointed them as court officials or had them receive positions under his subordinates.
Deng Ai had Liu Shan live in his old palace and personally went to visit. The various Shu defensive positions received Liu Shan’s edict and then surrendered.
Jiang Wei went to Fu County and surrendered to Zhong Hui.
Deng Ai learned that Huang Hao, a eunuch of Shu, was treacherous and arrested him, preparing to execute him. Huang Hao bribed Deng Ai’s subordinates and was spared.
Deng Ai appointed Shi Zuan to concurrently serve as Inspector of Yi Province and appointed Qian Hong, Administrator of Longxi, and others to concurrently serve as administrators of the various commanderies in Shu.
He sent people to Mianzhu to bury together the Wei soldiers who died in battle and the Shu soldiers who died, building a high platform as a jingguan to publicise his military achievements.
Pride and downfall
Deng Ai, having achieved this great merit, was deeply proud and often displayed and boasted about it, taking it as glory. He once said to Shu scholars and officials: “You gentlemen are fortunate to have met me, so you have today. If you had met someone like Wu Han, you would have been killed long ago.”
He also said: “Jiang Wei is naturally a hero of the time, but when he met me, he was at the end of his rope.”
Those with insight saw him so boastful and often laughed at him behind his back.
These things became the pretext for Zhong Hui, an ambitious man, to put him to death.
The false accusation
After Jiang Wei and others surrendered to Zhong Hui, Zhong Hui was overjoyed and could not wait to submit a memorial to Sima Zhao reporting his achievements.
On the twenty-fourth day of the twelfth month, Cao Wei appointed Deng Ai as Grand Commandant and Zhong Hui as Minister over the Masses.
Cao Huan, Emperor of Wei, issued an edict praising Deng Ai’s achievements, saying: “Deng Ai displayed military might and inspired state prestige. He advanced deep into enemy territory, killed generals and captured flags, eliminated enemy leaders, and made the one who falsely claimed to be emperor bind his neck and surrender. The fugitive who had been wanted for many generations was pacified in one morning.
“The fighting did not exceed the scheduled time, and the battle ended quickly. He swept through the west and pacified Ba and Shu. Even if Bai Qi attacked the strong Chu, Han Xin worked hard to defeat the strong Zhao, Wu Han captured Gongsun Shu, and Zhou Yafu pacified the Seven States, if we calculate achievements and discuss merit, they all still cannot compare to Deng Ai.
“Therefore, we appoint Deng Ai as Grand Commandant and increase his fief by twenty thousand households. We enfeoff his two sons as Marquises within the Passes, each receiving a fief of one thousand households.”
The memorial
After Deng Ai destroyed Shu, he submitted to Sima Zhao his views on the situation and the measures he planned to take: “Military strategists emphasise first establishing prestige, then truly attacking with strength. Now, relying on the prestige of pacifying Western Shu, taking advantage of the momentum to attack Wu, this is the favourable opportunity to sweep through the realm.
“However, after large-scale military operations, the officers and soldiers all feel very tired and cannot easily use troops. We should temporarily wait and see, first leaving twenty thousand troops from Longyou and twenty thousand troops from Ba and Shu to boil salt and smelt iron, preparing for military and agricultural purposes, and at the same time building ships, preparing in advance for later following the river to attack Eastern Wu.
“After completing this, announce it to the realm, letting Eastern Wu know the situation they face and understand the relationship between advantage and disadvantage. Eastern Wu will certainly submit. In this way, we can pacify Eastern Wu without attacking.
“Now we should treat Liu Shan generously to induce Sun Xiu, Emperor Jing of Wu, to submit. We should pacify officers, soldiers, and common people to attract people from afar.
“If we send Liu Shan to the capital, the people of Wu will think this is house arrest and exile, which is truly unfavourable for persuading them to submit. We should temporarily keep Liu Shan and wait until next year, autumn and winter. By then, Eastern Wu can also be completely pacified.
“We can enfeoff Liu Shan as King of Fufeng, grant him resources, send people to serve him, and let him enjoy it. Within the commandery, there is Dong Zhuo’s fort as his palace. Enfeoff his sons as dukes and marquises, dividing one county in the commandery as a fief to show the favour gained from submitting to the court.
“Set up Guangling and Chengyang as kingdoms to wait for Sun Xiu, Ruler of Wu, to surrender. In that way, Eastern Wu will fear our might and virtue and submit at the sight of our forces.”
Deng Ai wholeheartedly planned strategies to destroy Wu. His various suggestions truly had far-sighted insight. However, he had arbitrarily accepted orders and appointed officials.
The trap
Zhong Hui modified the communications between Deng Ai and Sima Zhao, changing Deng Ai’s memorials to be arrogant and disrespectful. Sima Zhao then had Wei Guan, the supervisor, warn Deng Ai: “This matter should be reported—it should not be implemented immediately.”
Deng Ai again submitted a memorial saying: “I received orders to campaign and have the emperor’s credentials. Since the enemy leader has already surrendered, we should appoint officials according to the old system to pacify them. This accords with the times.
“Now Shu has completely submitted, and our territory has reached the southernmost point. The east borders Wu and Hui, and we should pacify them early. If we wait for court orders, the round trip on the roads will consume many days.
“The Spring and Autumn Annals has this saying: When a great officer goes out to guard a foreign place, if he encounters things that protect the state and benefit the state, acting on his own authority is permissible.
“Now Eastern Wu is not yet pacified, and the terrain is connected to Ba and Shu. We should not be bound by common law and lose the opportunity.
“Sun Tzu’s Art of War says: ‘Advancing is not for fame, and retreating does not fear blame.’ Although I, Deng Ai, do not have the style of the ancient worthies, I still want to not abandon myself and harm the state’s interests.”
Zhong Hui saw that Deng Ai relied on his achievements and was proud, and took the opportunity to falsely accuse Deng Ai to Sima Zhao of plotting rebellion. Hu Lie and Shi Zuan also said that what Deng Ai did was contrary to the Way and had already shown signs of rebellion.
Arrest and death
On the first day of the first month of 264 CE, the court issued an edict to arrest Deng Ai and his son and send them to the capital in a prison cart.
Zhong Hui ordered Wei Guan to arrest Deng Ai. Wei Guan entered Chengdu that night and announced to the various generals under Deng Ai’s command, saying that the edict ordered Deng Ai’s arrest and that the others would not be questioned. If they came forward and submitted to the government army, their titles and rewards would be the same as before. If they did not come forward, their three clans would be executed.
The next day at dawn, the officers and soldiers all came to submit to Wei Guan, leaving only Deng Ai’s subordinates in his tent.
After daybreak, Wei Guan rode in the messenger’s cart and directly entered the front of the Chengdu palace. Deng Ai was still lying in bed and had not yet gotten up when he was arrested together with his son Deng Zhong.
Deng Ai looked up to the sky and sighed: “I am a loyal minister, yet I have come to this point. Bai Qi’s situation has reappeared today.”
Deng Ai’s various generals wanted to rescue Deng Ai and took up weapons and went directly to Wei Guan’s camp. Wei Guan went out lightly to meet them and falsely claimed he had written a draft memorial and was about to explain Deng Ai’s matter. The various generals believed him and therefore did not act.
Zhong Hui’s rebellion and Deng Ai’s death
On the fifteenth day of the first month, Zhong Hui arrived at Chengdu and had Deng Ai sent to Luoyang in a prison cart.
At this time, Zhong Hui had over two hundred thousand Wei and Shu troops under his command. Zhong Hui had eliminated Deng Ai, who had the great achievement of destroying Shu, and controlled a large expeditionary army, so he secretly plotted rebellion.
Sima Zhao had long been on guard against Zhong Hui’s ambitions and sent Jia Chong, General Who Protects the Army, to lead ten thousand infantry and cavalry into Shu to occupy Lecheng, then personally led one hundred thousand troops to advance to Chang’an, catching Zhong Hui unprepared.
Zhong Hui then detained all Wei generals and displayed a so-called edict from the empress dowager deposing Sima Zhao. Jiang Wei, a Shu general who had surrendered, encouraged Zhong Hui to kill the detained generals, plotting to take the opportunity to kill Zhong Hui and restore Shu Han.
Because Zhong Hui hesitated and the news leaked, on the eighteenth day at noon, Hu Yuan, son of Hu Lie, General Who Protects the Army, led Hu Lie’s troops, beating drums and shouting, and the officers and soldiers of each camp, to rescue their own generals, responded together and swarmed into the Shu palace.
The generals detained in the palace rushed out and joined with their troops. Both sides fought fiercely inside and outside the palace city, killing Jiang Wei, Zhong Hui, and several hundred of their troops, and killing Liu Xuan, Crown Prince of Shu Han, and Jiang Wei’s wife and children.
Wei forces plundered extensively. Later, Wei Guan, the supervisor, restored order and stabilised the situation.
The final betrayal
After Zhong Hui died, Deng Ai’s original camp’s officers and soldiers broke the prison cart and rescued Deng Ai, welcoming him back to Chengdu.
Wei Guan, because he had participated in falsely accusing Deng Ai and wanted to monopolise the achievement of killing Zhong Hui, feared there would be changes.
Previously, when Deng Ai’s army entered Jiangyou, Tian Xu, because he did not dare to advance, was about to be executed but was later pardoned by Deng Ai.
Wei Guan then sent Tian Xu, General Who Protects the Army, to pursue Deng Ai to Mianzhu (present-day Deyang, Sichuan) and said to him: “You can avenge the humiliation you received at Jiangyou.”
Tian Xu attacked Sanzao Pavilion west of Mianzhu at night and killed Deng Ai. His son Deng Zhong and Shi Zuan were also killed together.
Deng Ai’s remaining sons in Luoyang were also executed. Deng Ai’s wife and grandsons were exiled to the Western Regions.
Posthumous rehabilitation
In 265 CE, the first year of Taishi, the Jin dynasty replaced Wei. Sima Yan issued an edict saying: “In the past, Wang Ling, Grand Commandant, plotted to depose the Duke of Qi, and the Duke of Qi ultimately could not maintain the throne. Deng Ai, General Who Conquers the West, relied on his achievements and lost his integrity. He should be executed.
“However, on the day the edict was issued, Deng Ai dispersed his troops and submitted to punishment with bound hands. Compared to those who sought life and committed evil, this is truly different.
“Now we pardon his family and let them return home. If there are no descendants, we can establish an heir for them so that the rites of sacrifice are not cut off.”
In 267 CE, the third year of Taishi, Duan Zhuo, a Gentleman Consultant who had followed Deng Ai to attack Shu, submitted a memorial speaking up for Deng Ai.
Once, Sima Yan discussed Zhuge Liang, Chancellor of former Shu Han, with Fan Jian, a Palace Attendant. Fan Jian took the opportunity to kowtow and said: “Your servant hears that the discussions of the realm all believe Deng Ai was wronged. Your Majesty knows but does not address this. Is this not what Feng Tang said: ‘Although you obtain Lian Po and Li Mu, you cannot use them’?”
Sima Yan laughed and said: “I am just planning to address this matter again. Your words have moved me.” He then issued an edict to address this matter again.
In 273 CE, the ninth year of Taishi, Sima Yan issued an edict saying: “Deng Ai established achievements and submitted to punishment without escaping. His descendants also became slaves. I often sympathise with them. We can appoint his grandson Deng Lang as Gentleman of the Palace.”
This was considered rehabilitation for Deng Ai.
Legacy in the west
When Deng Ai was in the west, he built boundary walls, passes, and fortifications and established fortresses. During the Taishi period, the Qiang launched a great rebellion and repeatedly killed inspectors. The roads to Liang Province were cut off.
The reason officials and common people were able to preserve themselves was entirely due to the fortresses Deng Ai had built in those years.
During the Xianning period, Fan Zhen, General Who Accumulates Arrows, served as Yamen of the Western Rong and was able to enter court to take leave. Sima Yan asked him about his previous experience. Fan Zhen said he had once been a general under Deng Ai’s command when Deng Ai attacked Shu.
Sima Yan again asked about Deng Ai’s matter. Fan Zhen fully explained Deng Ai’s loyalty, speaking until he wept.
Previously, Deng Lang had served as Magistrate of Danshui and was therefore transferred to Magistrate of Dingling.
Personality
Deng Ai was known for his military talent, strategic insight, and ability to overcome disadvantages. Despite having a stutter, he was a talented strategist and did not let this limitation impede his career.
He was described as having a strong and resolute character, able to establish achievements and accomplish tasks. However, he was “dark about preventing disaster”—he could predict Zhuge Ke’s fall but could not see his own danger.
He was known for being strict and sometimes harsh with subordinates, which caused some resentment. However, he was also dedicated to his duties and worked hard, personally leading by example in difficult situations.
His pride after the conquest of Shu, while understandable given his achievement, contributed to his downfall. His boastful statements and unauthorised appointments gave Zhong Hui the pretext to falsely accuse him.
Military achievements
Agricultural planning
Deng Ai’s planning for agricultural colonies and waterworks in Huainan and Huaibei greatly strengthened Wei’s economy and military supply system, providing the foundation for later campaigns.
Battle of Qucheng
Deng Ai correctly predicted Jiang Wei’s attack on Taocheng and occupied it first, preventing Jiang Wei’s success.
Battle of Didao
Although Deng Ai suggested abandoning Didao, he participated in the successful relief of the siege, showing his ability to work with others even when his advice was not followed.
Battle of Duangu
Deng Ai’s greatest victory against Jiang Wei, where he correctly predicted Jiang Wei’s movements and defeated him decisively, causing heavy casualties.
Campaign against Zhuge Dan
Deng Ai successfully defended against Jiang Wei’s attack while Zhuge Dan’s rebellion was being suppressed, demonstrating his ability to maintain defensive positions.
Battle of Houhe
Deng Ai again defeated Jiang Wei, correctly analysing that Jiang Wei’s long supply line made him vulnerable.
The Yinping crossing
Deng Ai’s most famous achievement—leading troops through seven hundred li of uninhabited dangerous terrain, wrapping himself in felt to roll down slopes, and emerging at Jiangyou to achieve the conquest of Shu.
Battle of Mianzhu
Deng Ai defeated Zhuge Zhan’s forces, killing Zhuge Zhan and his son, clearing the path to Chengdu.
Conquest of Shu
Deng Ai’s overall achievement in conquering Shu Han, forcing Liu Shan to surrender and ending the Shu Han state.
Relationships
With Sima Yi
Sima Yi recognised Deng Ai’s talent and promoted him, beginning Deng Ai’s rise. This meeting was a major turning point in Deng Ai’s life.
With Sima Shi
Deng Ai served under Sima Shi and his advice was often adopted. He correctly predicted Zhuge Ke’s fall.
With Sima Zhao
Deng Ai served under Sima Zhao and achieved the conquest of Shu. However, Sima Zhao became suspicious of Deng Ai after his unauthorised appointments and boastful statements, leading to Deng Ai’s arrest.
With Jiang Wei
Deng Ai repeatedly defeated Jiang Wei in battle, correctly predicting his movements and exploiting his weaknesses. Their rivalry was one of the most significant military contests of the late Three Kingdoms period.
With Zhong Hui
Deng Ai and Zhong Hui were both involved in the conquest of Shu but had different approaches. Zhong Hui resented Deng Ai’s achievement and falsely accused him of rebellion, leading to Deng Ai’s arrest and death.
With Wei Guan
Wei Guan served as supervisor of the campaign and participated in falsely accusing Deng Ai. After Zhong Hui’s rebellion, Wei Guan sent Tian Xu to kill Deng Ai to prevent his return and potential revenge.
Anecdotes
The stutter
Deng Ai had a stutter and would say “Ai, Ai” when referring to himself. Sima Zhao once teased him: “You always say ‘Ai, Ai’—exactly how many ‘Ai’ are there?” Deng Ai replied: “The saying ‘phoenix, phoenix’ still refers to only one phoenix.” This, together with Zhou Chang of the Han dynasty, became the idiom “qiqi aiai” (stuttering).
The dream
Before attacking Shu, Deng Ai dreamed he was sitting on a mountain looking at flowing water. He asked Ai Shao, General Who Exterminates Bandits, about the dream’s meaning. Ai Shao calculated it as the Jian hexagram and said: “Even if you can defeat Shu Han, I fear the general will find it difficult to return to the state.” This later proved true.
Wrapping in felt
During the Yinping crossing, when the road was cut off at Mageshan, Deng Ai wrapped himself in felt and rolled down the slope, personally leading by example and enabling the troops to continue.
”If you had met Wu Han”
After conquering Shu, Deng Ai boastfully said to Shu officials: “You gentlemen are fortunate to have met me, so you have today. If you had met someone like Wu Han, you would have been killed long ago.” This statement showed his pride and contributed to his downfall.
”Bai Qi’s situation”
When Deng Ai was arrested, he sighed: “I am a loyal minister, yet I have come to this point. Bai Qi’s situation has reappeared today.” This referred to Bai Qi, a famous general of Qin who was forced to commit suicide after his achievements.
Achievements
- Planned agricultural colonies and waterworks in Huainan and Huaibei
- Defeated Jiang Wei multiple times (Qucheng, Duangu, Houhe)
- Successfully defended against Jiang Wei during Zhuge Dan’s rebellion
- Led the daring Yinping crossing
- Conquered Shu Han, forcing Liu Shan to surrender
- Achieved rank of Grand Commandant (posthumously)
Behind the scenes
Historical sources
Deng Ai’s biography appears in Records of the Three Kingdoms by Chen Shou, where he is grouped with Wang Ling, Guanqiu Jian, Zhuge Dan, and Zhong Hui. Chen Shou wrote: “Deng Ai was strong and resolute, established achievements and accomplished tasks. However, he was dark about preventing disaster, and misfortune and failure came quickly. How could he predict Zhuge Ke from afar but not see himself up close? This is what the ancients called ‘eye theory’.”
The stutter
Deng Ai’s stutter is notable because he achieved high rank and important responsibilities despite this limitation. His ability to overcome this demonstrates his determination and the recognition of his talent by his superiors.
The Yinping crossing
Deng Ai’s Yinping crossing is considered one of the most daring military operations in Chinese history. The seven-hundred-li journey through uninhabited terrain, wrapping in felt to roll down slopes, and emerging to achieve victory has become legendary.
The conspiracy
Deng Ai’s death was the result of a complex conspiracy involving Zhong Hui’s false accusations, Wei Guan’s participation, and Sima Zhao’s suspicions. His unauthorised appointments and boastful statements gave his enemies the pretext they needed.
Posthumous rehabilitation
Deng Ai’s posthumous rehabilitation reflects recognition of his achievements and the injustice of his death. The fact that his fortresses in the west helped preserve people during later rebellions shows the lasting value of his work.
Historical evaluations
Contemporary
Cao Mao praised Deng Ai: “Deng Ai planned with method and was loyal and brave, inspiring. He killed over ten generals and captured over a thousand heads. State prestige shook Ba and Shu, and military reputation spread to the Jiang and Min.”
Cao Huan praised Deng Ai: “Deng Ai displayed military might and inspired state prestige. He advanced deep into enemy territory, killed generals and captured flags, eliminated enemy leaders, and made the one who falsely claimed to be emperor bind his neck and surrender. The fugitive who had been wanted for many generations was pacified in one morning.
“The fighting did not exceed the scheduled time, and the battle ended quickly. He swept through the west and pacified Ba and Shu. Even if Bai Qi attacked the strong Chu, Han Xin worked hard to defeat the strong Zhao, Wu Han captured Gongsun Shu, and Zhou Yafu pacified the Seven States, if we calculate achievements and discuss merit, they all still cannot compare to Deng Ai.”
Later historians
Chen Shou wrote: “Deng Ai was strong and resolute, established achievements and accomplished tasks. However, he was dark about preventing disaster, and misfortune and failure came quickly.”
Duan Zhuo wrote: “Deng Ai’s heart was extremely loyal, yet he bore the name of rebellion. He pacified Ba and Shu yet received the punishment of extermination. Your servant privately grieves for him. What a pity—to say Deng Ai rebelled!
“Deng Ai’s nature was rigid and urgent. He offended refined and common people and could not cooperate with his peers, so no one was willing to speak for him…
“In the past, Jiang Wei had the intention to cut off Longyou. Deng Ai repaired defences and prepared, accumulated grain and strengthened troops. When there was drought and famine, Deng Ai used the qu method, personally wearing black clothing and holding plows and hoes to lead the officers and soldiers. Superiors and subordinates were moved, and none did not exhaust their strength.
“Deng Ai held credentials and guarded the frontier, commanding tens of thousands, yet he did not avoid the labour of servants and captives or the service of officers and people. If not for someone who held integrity, was loyal, and was diligent, who could be like this?
“Therefore, in the battles of Luomen and Duangu, he attacked many with few and destroyed the strong enemy. The First Ruler knew he could be trusted and entrusted Deng Ai with planning victory in the temple, granting him a long strategy.
“Deng Ai received orders and forgot himself, bound horses and suspended carts, personally throwing himself into a place of death. His courage reached the clouds, and the officers and soldiers took advantage of the momentum, making Liu Shan and his ministers bind themselves and surrender with folded hands and bent knees.
“Deng Ai’s achievements and fame were established and should be written on bamboo and silk and passed down for ten thousand generations. A seventy-year-old man—what else would he seek in rebellion?
“Deng Ai truly relied on the kindness of being nurtured and did not suspect himself. He falsely accepted orders and established a system to temporarily pacify the state. Although this violated common law, it accorded with ancient righteousness. Judging by the heart and determining the crime, this is worthy of discussion…
“Loyal yet receiving execution, trusted yet being suspected, head hung in the horse market, all sons executed together—those who saw it wept, and those who heard it sighed…
“Now the people of the realm grieve and hate for Deng Ai—it is also like this.”
Legacy
Deng Ai is remembered as one of the most outstanding military strategists of the late Three Kingdoms period. His talent has been compared to that of Zhuge Liang and Sima Yi. His Yinping crossing is considered one of the most daring military operations in Chinese history and has been studied by military strategists for centuries.
His agricultural planning in Huainan and Huaibei greatly strengthened Wei’s economy and provided the foundation for later campaigns. His repeated victories over Jiang Wei demonstrated his military insight and tactical ability.
However, his inability to protect himself after his great achievement serves as a cautionary tale. His pride, unauthorised appointments, and boastful statements gave his enemies the pretext they needed to destroy him.
His posthumous rehabilitation reflects recognition of his achievements and the injustice of his death. The fact that his fortresses in the west helped preserve people during later rebellions shows the lasting value of his work.
His story represents both the heights of military achievement and the dangers of success—a general who conquered a kingdom but fell victim to political intrigue.
Timeline
- 195 CE: Born in Jiyang, Yiyang Commandery
- 208 CE: Forcibly relocated to Runan with his mother
- c. 220 CE: Became Clerk Who Guards Rice Fields
- c. 240 CE: Met Sima Yi; appointed Clerk to the Grand Commandant; promoted to Gentleman of the Palace
- 240–241 CE: Planned agricultural colonies and waterworks; wrote “Discussion on Crossing the River”
- 243 CE: Appointed to participate in military affairs of campaign against the west; transferred to Administrator of Nan’an
- 249 CE: Participated in Battle of Qucheng; correctly predicted Jiang Wei’s attack on Taocheng; enfeoffed as Marquis within the Passes
- 251 CE: Transferred to Administrator of Chengyang; submitted advice on Xiongnu
- 251 CE: Transferred to Administrator of Runan
- 253 CE: Predicted Zhuge Ke’s fall
- 254–255 CE: Transferred to Inspector of Yan Province; promoted to General Who Spreads Martial Might
- 255 CE: Participated in suppressing Guanqiu Jian’s rebellion; appointed Colonel of Rapid as Tigers; enfeoffed as Marquis of Fangcheng Township; acted as General Who Pacifies the West
- 255 CE: Participated in Battle of Didao; appointed General Who Pacifies the West with Credentials
- 256 CE: Battle of Duangu; greatly defeated Jiang Wei; appointed General Who Guards the West and Commander of Longyou; enfeoffed as Marquis of Deng
- 257–258 CE: Defended against Jiang Wei during Zhuge Dan’s rebellion; promoted to General Who Conquers the West
- 262 CE: Battle of Houhe; again defeated Jiang Wei
- 263 CE: Initially opposed attacking Shu; persuaded to participate; led Yinping crossing; conquered Shu Han; appointed Grand Commandant (posthumously)
- 264 CE: Arrested on false charges; rescued after Zhong Hui’s rebellion; killed by Tian Xu on Wei Guan’s orders
- 265 CE: Posthumously pardoned by Sima Yan
- 273 CE: Posthumously rehabilitated; grandson Deng Lang appointed Gentleman of the Palace
See also
References
- Chen Shou. Records of the Three Kingdoms, Volume 28, Biography of Deng Ai.
- Pei Songzhi. Annotations to Records of the Three Kingdoms.
- Fang Xuanling. Book of Jin, Biography of Duan Zhuo.
- Sima Guang. Zizhi Tongjian, various volumes.