Luandi Yizhixie

Biography

Family Background and Early Life

Yizhixie came from the Xiongnu Luandi clan, was a descendant of Modu Chanyu, and was the younger brother of Junchen Chanyu. After Modu, Xiongnu succession never developed into a strict system of primogeniture; succession from elder brother to younger brother coexisted with succession from father to son. During Junchen Chanyu's reign, Yizhixie served as Left Guli King. This was a high-ranking Xiongnu office generally held by a member of the Chanyu's family, commanding forces in the eastern sector and ranking among the more powerful members of the Twenty-Four Leaders. Yizhixie spent much of this period in the eastern Xiongnu domains and controlled substantial military forces, giving him the power base from which he later contested the Chanyu position.

Han–Xiongnu relations reached a turning point during Junchen Chanyu's reign. Under Emperors Wen and Jing, the Han used heqin to maintain relative peace on the frontier, although Xiongnu raids continued periodically. After Emperor Wu came to power and Han strength increased, policy toward the Xiongnu gradually hardened. In 133 BCE, the second year of the Yuanguang era, Emperor Wu set the ambush at Mayi in an attempt to destroy the main Xiongnu force. The plan was exposed and failed, and Han–Xiongnu relations broke down completely, beginning a prolonged period of warfare. In the later years of Junchen Chanyu's reign the two sides fought repeatedly; each had victories and defeats, but the Xiongnu's former military advantage had begun to erode.

Seizing the Chanyu Position and Early War with the Han

Junchen Chanyu died in 126 BCE, the third year of the Yuanshuo era. In the ensuing Xiongnu power struggle, Yizhixie defeated Junchen's crown prince Yudan and proclaimed himself Chanyu. After his defeat, Yudan fled to the Han, where Emperor Wu enfeoffed him as Marquis of She'an; he died in the same year. After taking power, Yizhixie continued the hostile policy toward the Han inherited from Junchen's later reign and repeatedly sent forces south to raid the Han frontier.

By this point, however, Han military power was much stronger than before. In the decade after Emperor Wu's accession, sustained recovery and military reforms greatly increased the effectiveness of Han cavalry, while a new generation of commanders including Wei Qing and Huo Qubing emerged. Between 126 and 123 BCE, Wei Qing repeatedly led forces beyond the frontier, recovered the Henan region in what is now the Hetao area of Inner Mongolia, and established Shuofang and Wuyuan commanderies. The Xiongnu Wise King of the Right suffered severe losses. Yizhixie attempted to respond but repeatedly suffered setbacks.

Defeat in Hexi and the Surrender of the Hunye King

In 121 BCE, the second year of the Yuanshou era, Emperor Wu appointed the twenty-year-old Huo Qubing General of Agile Cavalry and sent him on two campaigns into Hexi. Huo led his troops deep into Xiongnu territory, covering more than a thousand li and inflicting heavy defeats on the Hunye and Xiutu kings, killing tens of thousands of Xiongnu soldiers and capturing a golden image used in sacrifices to Heaven. Yizhixie Chanyu was furious over the losses in Hexi and intended to summon the Hunye and Xiutu kings to the royal court for punishment. Fearing for their lives, the two kings secretly planned to surrender to the Han. The Xiutu King later changed his mind and was killed by the Hunye King, who then led more than 40,000 people in surrendering to the Han. Emperor Wu established Jiuquan, Wuwei, Zhangye, and Dunhuang commanderies on the former lands of the Hunye King, cutting the connection between the Xiongnu and the Qiang. The Hexi Corridor thereafter entered Han control. Yizhixie's sphere contracted further, and the Xiongnu's western domains were nearly lost.

Battle of Mobei and the Northern Withdrawal

In 119 BCE, the fourth year of the Yuanshou era, Emperor Wu decided to launch a decisive campaign against the Xiongnu. He ordered Wei Qing and Huo Qubing each to lead 50,000 cavalry, supported by hundreds of thousands of infantry and logistical personnel, on two routes deep into Mobei. Learning of the Han advance, Yizhixie Chanyu adopted Zhao Xin's advice to move his main force far into Mobei, hoping to wait at full strength and use the barren environment to exhaust the Han army.

Wei Qing marched from Dingxiang more than a thousand li north and encountered Yizhixie's main force. Han troops formed a defensive camp with Wugang wagons and then sent 5,000 cavalry against the Xiongnu line. The armies fought for a full day. At dusk a sandstorm arose, and Wei Qing used the conditions to envelop the Xiongnu from both flanks. The Xiongnu formation collapsed. Seeing that the situation was lost, Yizhixie broke out with several hundred elite cavalry and escaped. The Han army pursued as far as Zhao Xin's city at Tianyan Mountain, burned stored grain, and returned. Huo Qubing's army marched from Dai Commandery and Youbeiping more than two thousand li north, heavily defeated the Xiongnu Wise King of the Left, performed the Feng ceremony at Mount Langjuxu and the Shan ceremony at Guyan, reached the Hanhai, and returned.

After the Battle of Mobei, the main Xiongnu force had suffered severe losses. Yizhixie withdrew far into Mobei, and Xiongnu power thereafter retreated from the Hetao and territories to its west. The source quotes the historical phrase, "After this the Xiongnu fled far away, and south of the desert there was no royal court." Separation from the well-watered pasturelands around the Yin Mountains severely constrained pastoral production and weakened Xiongnu strength. The Han used the captured eastern Xiongnu lands to relocate Wuhuan groups that had formerly been Xiongnu subjects outside the frontiers of Shanggu, Yuyang, Youbeiping, Liaodong, and Liaoxi commanderies, where they watched Xiongnu movements for the Han. Zhang Qian was also sent to the Western Regions to establish ties with the Yuezhi and Dayuan, while a Han princess was married to the Wusun Kunmo, weakening the Xiongnu–Wusun alliance. In the later years of Yizhixie's reign, Xiongnu power continued to decline and could no longer mount large-scale offensives against the Han.

Later Years and Death

After the Battle of Mobei, Yizhixie Chanyu remained in Mobei. Although small-scale raids on the Han frontier continued, he could no longer alter the broader balance in which Han power had become dominant and Xiongnu strength had weakened. Yizhixie died in 114 BCE, the third year of the Yuanding era, and was succeeded by his son Wuwei Chanyu. The source states that Yizhixie ruled for about twelve years, during which the Xiongnu shifted from a steppe power capable of confronting the Han on relatively equal terms to a weakened polity forced northward, a change closely linked to Emperor Wu's sustained northern offensives.

Major Activities

Contest for the Chanyu Position

After Junchen Chanyu's death, Yizhixie used the military strength attached to his position as Left Guli King to defeat crown prince Yudan and proclaim himself Chanyu. This was an important episode in Xiongnu internal politics and directly resulted in Yudan's surrender to the Han, giving the Han a political advantage. Yizhixie's seizure of power resembled Modu Chanyu's violent accession in that it displaced an expected heir, but Yizhixie did not kill his father; rather, he defeated his nephew in a conflict between the Xiongnu principles of fraternal and patrilineal succession.

Wars with the Han

Yizhixie Chanyu fought the Han for more than a decade. Major campaigns included:

• In 124 BCE, Wei Qing marched from Shuofang and Gaoque against the Wise King of the Right, nearly annihilating his forces and destroying Xiongnu control in the Hetao region.
• In 123 BCE, Wei Qing, Huo Qubing, and others marched from Dingxiang. Huo Qubing led 800 cavalry deep into enemy territory, killed or captured more than two thousand people, and was enfeoffed as Marquis of Champion.
• In 121 BCE, Huo Qubing campaigned twice in Hexi and inflicted major defeats on the Hunye and Xiutu kings. The Hunye King surrendered to the Han, and control of the Hexi Corridor changed hands.
• In 119 BCE, at the Battle of Mobei, Wei Qing broke Yizhixie's main force. Yizhixie escaped with only several hundred cavalry, and the Xiongnu withdrew north into Mobei, leaving no royal court south of the desert.

Management of the Western Regions and Failure

During Yizhixie's reign, the Han used Zhang Qian's missions to the Western Regions to strengthen relations with the Yuezhi, Dayuan, Wusun, and other states in an attempt to encircle the Xiongnu from the west. The Han used a heqin marriage to weaken the alliance between the Xiongnu and Wusun, and states of the Western Regions gradually leaned toward the Han. Yizhixie attempted to preserve Xiongnu influence there, but continued Han pressure limited his success.

Xiongnu Internal Affairs

Xiongnu internal politics were unstable during Yizhixie's reign. The surrender of the Hunye King and the killing of the Xiutu King marked the collapse of the western Xiongnu domains. The Han also used the Wuhuan to observe Xiongnu movements, seriously weakening the Xiongnu's eastern defenses. By the later part of Yizhixie's reign, the main Xiongnu forces had withdrawn into Mobei, tribes were dispersed, and overall strength had substantially declined.

Personal Relations

• Junchen Chanyu: elder brother; died in 126 BCE, after which Yizhixie defeated his crown prince Yudan and proclaimed himself Chanyu
• Yudan: nephew and crown prince of Junchen Chanyu; defeated by Yizhixie, surrendered to the Han, was enfeoffed as Marquis of She'an, and died the same year
• Wuwei Chanyu: son; succeeded Yizhixie after his death in 114 BCE
• Wushilu Chanyu: grandson; son of Wuwei Chanyu, known as the Child Chanyu
• Zhao Xin: Xiongnu defector from the Han, formerly a Han general; after surrendering to the Xiongnu he married the Chanyu's elder sister, advised Yizhixie, and recommended moving far into Mobei to avoid the main Han forces
• Hunye King: one of the kings of the western Xiongnu domains; surrendered to the Han with his followers after fearing punishment for defeat in Hexi
• Xiutu King: another king of the western Xiongnu domains; planned to surrender with the Hunye King but changed his mind and was killed
• Emperor Wu of Han: Western Han emperor who launched comprehensive offensives against the Xiongnu and was Yizhixie's principal opponent
• Wei Qing: Han General-in-Chief who repeatedly defeated Xiongnu forces and broke Yizhixie's main army at the Battle of Mobei
• Huo Qubing: Han General of Agile Cavalry who twice campaigned in Hexi, defeated the Xiongnu, and performed ceremonies at Mount Langjuxu
• Zhang Qian: Han envoy to the Western Regions who established contacts with the Yuezhi, Wusun, and other states and helped weaken the Xiongnu–Wusun alliance

Historical Assessment

Han and Contemporary Assessments

• Sima Qian records Yizhixie Chanyu in the "Account of the Xiongnu" in the Records of the Grand Historian, stating that he "proclaimed himself Chanyu" and describing his wars with the Han in detail without offering a clear value judgment.
• Ban Gu's Book of Han, "Account of the Xiongnu," largely follows the Records of the Grand Historian. Its evaluation is embedded in a Han-centered framework in which Xiongnu violations of agreements and frontier raids are presented as prompting Han counterattacks.
• From the official Han perspective, Yizhixie was a principal enemy. His defeat and northern withdrawal were treated as major achievements of Emperor Wu, and the phrase "no royal court south of the desert" became a symbol of Han military success.

Later Historians

• Sima Guang's Comprehensive Mirror in Aid of Governance records the wars between Yizhixie and the Han in detail. It partly affirms Emperor Wu's northern campaigns while also criticizing prolonged warfare for exhausting the people and state resources.
• Song scholars often wrote within a Hua–Yi framework and depicted Yizhixie as a representative northern "barbarian" enemy, although some acknowledged his military ability.
• Ming and Qing historians such as Wang Fuzhi, when discussing Emperor Wu's northern campaigns, often argued that although the Han won, it also suffered heavy costs, while the defeated Xiongnu were not destroyed; both sides therefore paid substantial prices.

Modern Assessments

• Modern scholars reassessing Yizhixie from the perspective of the history of interethnic relations regard him as an important Xiongnu ruler whose reign marked the transition from strength to decline and a key stage in the prolonged competition between steppe pastoral and agrarian states.
• Some researchers argue that Yizhixie's defeats cannot be explained purely as military failures, but reflect deeper problems in Xiongnu political structure and economic foundations that became concentrated under intense Han military pressure.
• Television works such as Emperor Wu of Han portray Yizhixie as one of Emperor Wu's principal opponents and introduce fictional elements, including depictions of him killing Junchen Chanyu and being killed by Han repeating crossbows, which differ from the historical account.