Li Cunjin

Biography

Family Background and Early Life

Li Cunjin was originally surnamed Sun and named Chongjin. He was from Zhenwu in Dai Commandery. His father, Sun Quan, came from a family that had served for generations as clerks of the Chanyu Protectorate. His exact year of birth is not recorded. Based on the statement that he was sixty-six when he died in 922, he is generally placed around 856, roughly the tenth year of the Dazhong era.

Sun Chongjin trained in martial skills from youth and became known locally for physical courage. He first served as a subordinate officer under Tang Qun, prefect of Lanzhou. This was the period of severe late-Tang disorder: the Huang Chao Rebellion swept through the Central Plains, central authority collapsed, and regional military governors expanded their power. Li Keyong, Military Commissioner of Hedong, rose in the northern frontier region and became one of the most important late-Tang warlords. When Li Keyong captured Shuozhou, Sun Chongjin entered his army. Li appreciated him, adopted him as a son, renamed him Li Cunjin, and enrolled him among the Adopted-Sons Army.

Campaigns and Adoption into the Li Clan

After becoming Li Keyong's adopted son, Li Cunjin followed him on campaigns across the empire. He accompanied Li into the Guanzhong region against the Huang Chao rebels and was appointed commander of the Adopted-Sons Army for his service. During the Jingfu era he joined Li Keyong's campaigns against Li Maozhen of Fengxiang and Wang Xingyu of Binning and received an acting court title for merit. He later joined Li Sizhao in defeating Wang Gong in the Hezhong region, helping consolidate Hedong influence there.

In 900, the third year of Guanghua, Khitan forces raided around Yunzhong. Li Cunjin was appointed commander of the Yongan Army and commander of forces north of Yanmen and took responsibility for the northern frontier. In 901, the first year of Tianfu, Zhu Quanzhong, Military Commissioner of Xuanwu and later founder of the Later Liang, launched a major assault on Hedong and pressed Taiyuan. Li Keyong's generals Li Sizhao and Li Siyuan helped repel the Later Liang army, while Li Cunjin, then commander at Yanmen, defeated a Liang vanguard at Dongwo and contributed to Zhu Quanzhong's withdrawal. In 903 he became prefect of Shizhou.

Assisting Zhuangzong in Founding the Later Tang

In 907, the fourth year of Tianyou, Zhu Wen replaced the Tang and founded the Later Liang. Li Keyong continued to use the Tang calendar and resisted the new dynasty. When Li Keyong died the following year, his son Li Cunxu inherited the title Prince of Jin. Li Cunjin, as one of the senior adopted brothers, remained loyal to the new ruler. Early in Li Cunxu's rule, Li Cunjin entered the central army as acting Minister of Works on the Right Infantry Command, led troops through Jingxing, and became cavalry inspector of the field army.

In 911 the Battle of Baixiang broke out between Jin and Later Liang. Li Cunjin campaigned with Li Cunxu and helped achieve a major victory. For his service he was appointed prefect of Binzhou and promoted to acting Minister of State. He was later made campaign commander on the southwestern front, recovered Cizhou, and received the prefectures of Cizhou and Qinzhou. In 915, after Li Cunxu brought Weibo under control, Li Cunjin became inspecting commissioner of the Tianxiong Army. Weibo had only just submitted, and arrogant elite formations such as the “Silver Spear Loyalty Corps” remained prone to disorder. Li Cunjin was calm but decisive and imposed harsh discipline, executing violators publicly. The army consequently became orderly.

In 917 he was promoted to Deputy Commissioner-General of the Fan and Han Cavalry and Infantry and accompanied Li Cunxu in fighting at Yangliu and Huliu Slope. In 919 he concurrently became Military Commissioner of Zhenwu and thus one of the regime's principal regional commanders.

The Desheng Floating Bridge and Final Campaign

During the Jin–Later Liang confrontation along the Yellow River, Jin held Desheng Ford near present-day Puyang, Henan, with northern and southern camps linked only by small boats. This greatly burdened transport. The Later Liang held Yangcun Ford and brought bamboo and timber from Luoyang to construct a floating bridge. Because the Hebei region lacked suitable bamboo and stone, most officers believed Jin could not do the same. Li Cunjin ordered soldiers to connect dozens of large vessels with reed ropes, raise earthen mounds, and set huge timbers on both banks to anchor the cables. At first many in the army treated the project as a joke, but after a little more than a month the bridge was completed, straight and orderly, and traffic across the river became easy. Li Cunxu raised a cup and praised him: “Cunjin is my Du Yu!” He granted him a fine horse and court robes, promoted him to acting Grand Guardian, and concurrently made him commander of Weibo cavalry and infantry. Li Cunjin and Li Cunshen thereafter held Desheng and repeatedly repelled Later Liang attacks.

In 922 Chengde fell into internal disorder. The officer Zhang Wenli killed Military Commissioner Wang Rong and submitted to the Later Liang. Li Cunxu sent Shi Jiantang, Yan Bao, Li Sizhao, and others to campaign against him, but they were defeated or killed in succession. In the seventh month Li Cunjin replaced Li Sizhao as northern campaign commander and established a fortified camp at Dongyuan Ford near present-day Zhengding, Hebei, on the Hutuo River. The sandy soil made construction difficult, so Li ordered trees cut and used rammed-earth techniques to complete the walls in ten days.

In the ninth month Zhang Chuqiu, son of Zhang Wenli, learned that Li Cunjin had grown careless and led 7,000 men in a surprise attack. Jin cavalry had already ridden toward Zhenzhou and passed the attacking force on a different road without meeting it. Li Cunjin hurried out with only a little more than ten horsemen and drove the attackers back below the bridge. The main enemy force then arrived while the Jin rear had not yet caught up. Li fought until he was killed on the bridge, at roughly sixty-six years of age. His troops later counterattacked and almost annihilated Zhang Chuqiu's 7,000 men. When news reached Jinyang, Li Cunxu was deeply grieved. Li Cunjin was posthumously honored as Defender-in-chief during the Later Tang Tongguang era.

Major Activities

Military Campaigns

Li Cunjin spent his life campaigning from the late Tang into the early Five Dynasties. In his early career he followed Li Keyong into the Guanzhong region against the Huang Chao Rebellion and later fought Wang Xingyu and Wang Gong. During the Jin–Later Liang struggle he participated in major battles including Baixiang, Yangliu, and Huliu Slope. In his final campaign, although already in his sixties, he took command against Zhenzhou and died in battle, becoming an example of the loyal veteran commander of the Five Dynasties.

The Desheng Floating Bridge

In 919 the Jin army held Desheng Ford but lacked bamboo and stone for a conventional floating bridge and relied on small boats between its two camps. Li Cunjin connected large ships with reed cables and anchored them to enormous timbers on both banks. The completed bridge solved a serious transport problem and had strategic importance because it joined the northern and southern camps into a single defensive system. Li Cunxu compared him to the Western Jin general Du Yu, indicating the high esteem in which the project was held.

Strict Military Discipline

In 915, as inspecting commissioner of the Tianxiong Army, Li Cunjin was responsible for controlling surrendered Later Liang troops in newly submitted Weibo. Elite formations such as the Silver Spear corps remained volatile. Li imposed strict law and publicly executed those who violated orders. Although harsh, this discipline stabilized the army in a period of civil war. The Old History of the Five Dynasties states that although his campaigns lacked spectacular feats, he was particularly respected for restraining unruly troops by law and for his meticulous preparation of camps and defenses.

Defense of the Northern Frontier

When Khitan forces raided Yunzhong in 900, Li Cunjin was placed in command of the Yongan Army and all forces north of Yanmen, giving him responsibility for Hedong's northern frontier. In 901, when the Later Liang attacked Taiyuan, he defeated part of the Liang vanguard at Dongwo and contributed to repelling Zhu Quanzhong's offensive.

Personal Relations

• Father: Sun Quan, from a family of clerks serving the Chanyu Protectorate
• Wife: Lady Liu of Pengcheng
• Sons: Li Hanshao (originally Sun Hanshao, later given the surname Li), Sun Hanwei, Sun Hanyin, Sun Hanxun, and Sun Hanjun
• Daughters: Sun Lu'er and Sun Huan'er
• Li Keyong: adoptive father and Military Commissioner of Hedong; adopted Sun Chongjin and renamed him Li Cunjin
• Li Cunxu: adoptive brother and ruler, later Emperor Zhuangzong of Later Tang; relied heavily on Li Cunjin and praised him as “Du Yu”
• Li Sizhao: another adopted son of Li Keyong; fought alongside Li Cunjin, whom Li later replaced in the Zhenzhou campaign
• Li Cunshen: jointly defended Desheng against Later Liang
• Shi Jiantang and Yan Bao: Jin commanders who had earlier campaigned unsuccessfully against Zhenzhou
• Zhu Quanzhong (Zhu Wen): founder of Later Liang and principal enemy of the Hedong regime
• Zhang Wenli and Zhang Chuqiu: rebel Chengde commanders; Li Cunjin died during the campaign against their forces

Historical Assessment

Five Dynasties / Contemporary Period

• The Old History of the Five Dynasties states that although Li Cunjin's expeditions produced no extraordinary wonders, he excelled in restraining arrogant troops through law and in the preparation of camps and defensive positions, and was praised for this.
• Li Cunxu: “Cunjin is my Du Yu,” comparing him to the Western Jin general Du Yu.
• Weibo troops and civilians were said to have been “all fearful and submissive” under his strict punishments, illustrating his authority as a disciplinarian.

Song–Yuan Period

• Xue Juzheng's Old History of the Five Dynasties gives Li Cunjin a full biography and records his military service in detail, affirming his loyalty and courage.
• Ouyang Xiu's New History of the Five Dynasties also records his career, including his service with Li Keyong and appointment as commander of the Adopted-Sons Army after the campaign against Huang Chao.
• The Comprehensive Mirror in Aid of Governance repeatedly mentions his activities in the Jin–Later Liang wars and treats him as an important founding commander of the Later Tang.

Ming and Qing Periods

• The Ming popular historical romance Romance of the Remnant Tang and Five Dynasties listed Li Cunjin among the “Thirteen Grand Guardians.” The ranking is fictional but reflects later popular recognition of his loyal-warrior image.
• Qing scholar Zhao Yi, discussing the adopted-son system of the Five Dynasties in Notes on the Twenty-Two Histories, used Li Cunjin and similar figures to illustrate the widespread practice of military governors adopting military retainers.
• Qing historian Qian Daxin examined Li Cunjin's original name and adoption history in Textual Criticism on the Twenty-Two Histories, confirming his birth name Sun Chongjin.

Modern Period

• Cai Dongfan's Romance of the Five Dynasties dramatized Li Cunjin's death as a heroic sacrifice and praised his loyalty.
• Modern scholar Tao Maobing, in A Brief History of the Five Dynasties, treated Li as an important member of Li Keyong's adopted-son military group and emphasized his contribution to the Jin–Later Liang wars.
• Contemporary studies also note the engineering significance of Li Cunjin's floating bridge, seeing it as evidence of the sophistication of Five Dynasties military engineering.