Introduction: This article records the fall of the Jin Dynasty. Besieged by Mongol armies, the Jin made a fatal mistake by attacking the Southern Song. The Song allied with the Mongols out of hatred, jointly destroying the Jin in 1234. This short‑sighted partnership removed the Jin buffer, soon exposing the Song to Mongol conquest.
The Tragic End of Xin Qiji and the Humiliation of 1206
In 1206, the Southern Song minister Han Tuozhou launched a premature northern expedition against the Jin Dynasty. Ignoring the cautious advice of the aging hero Xin Qiji, Han dismissed him from office. As predicted, the Song army suffered a crushing defeat, retreating in chaos until Bi Zaiyu, a descendant of the legendary Yue Fei’s army, managed to hold the line at the Yangtze River. Realizing his error, Han Tuozhou attempted to recall Xin Qiji to lead the defense. However, the great poet-general, already gravely ill from frustration and anger, could barely stand to receive the imperial decree. Days later, Xin Qiji passed away, his final words a desperate cry: “Kill the traitors! Kill the traitors!”
The failed campaign forced the Song into a humiliating peace. The Jin, emboldened by victory, demanded that Song address them as “uncle” and insisted on the execution of Han Tuozhou as a condition for peace. In a shocking internal coup, Minister Shi Miyuan, conspiring with Empress Yang, assassinated Han Tuozhou, severed his head, and sent it to the Jin court. With this gruesome tribute, peace was secured, but the spirit of northern restoration within the Song court was effectively extinguished for decades.
The Rise of Genghis Khan and the Jin’s Internal Collapse
While the Song and Jin were locked in their struggle, a new power emerged from the northern steppes. In 1206, Temujin unified the Mongol tribes and was proclaimed Genghis Khan. Having established a vast empire stretching to Europe and West Asia, Genghis Khan turned his sights south, citing historical grievances against the Jin for the death of his ancestor Ambaghai. In 1211, he led a massive invasion, accompanied by his sons Jochi, Chagatai, and Ogedei.
At the Wushabu fortress, the Jin army was decimated by the swift Mongol cavalry. The Jin general Hushahu fled to the capital, Zhongdu (modern Beijing). Instead of punishing him, Emperor Weishao Wang appointed him to defend the city. As the Mongols besieged Zhongdu, they prioritized seizing livestock and supplies over immediate conquest. Inside the city, Hushahu staged a coup, killing Weishao Wang and installing Wanyan Xun as Emperor Xuanzong. Hushahu was subsequently killed by his own subordinate, Shuhu Gaqi, who seized control of the military. Emperor Xuanzong, desperate to save the capital, agreed to a humiliating peace, offering gold, silk, horses, a princess, and hundreds of children to Genghis Khan, who then withdrew.
The Fatal Mistake: Moving South and Attacking the Song
Fearing the proximity of the Mongols, Emperor Xuanzong decided to move the capital from Zhongdu to Nanjing (Kaifeng), the former Song capital. Despite warnings from officials like Wanyan Bi that abandoning the ancestral tombs in Zhongdu would signal the loss of the north, and objections from Chancellor Shan Yi about the strategic importance of the center, the court relocated. Seizing the opportunity, Genghis Khan sent his general Muqali to seize the north. With the emperor gone, many Jin officials defected, and soon the entire region north of the Yellow River fell to the Mongols.
Trapped in the south, the Jin court faced a critical dilemma. Minister Xu Ding advised forming an alliance with the Song to resist the Mongols, invoking the lesson of “lips and teeth” (if the lips are gone, the teeth will be cold). However, the warmonger Shuhu Gaqi argued for expanding southward into Song territory, claiming the Song were weak and had stopped paying tribute. Blinded by short-term gain, Emperor Xuanzong authorized an invasion of the Southern Song in 1217. This strategic blunder forced the Song to fight on two fronts and destroyed any possibility of a united front against the rising Mongol threat.
The Song Resistance and the Death of Shuhu Gaqi
Contrary to Jin expectations, the Song resistance was fierce. In the battles of Xiangyang and Zaoyang, Song generals Zhao Fang, Hu Zaixing, and Meng Zongzheng inflicted devastating defeats on the Jin forces. At Zaoyang, Meng Zongzheng employed clever tactics, including poisoning tunnels and setting fire to siege towers, causing heavy casualties. When Hu Zaixing struck the Jin rear, destroying their supply lines, the Jin army collapsed. Following these disasters, the architect of the war, Shuhu Gaqi, was killed in an internal purge, and Emperor Xuanzong was forced to sue for peace with the Song, ordering his troops to cease southern attacks.
The Mongol Strategy and the Song’s Short-Sighted Alliance
Years later, both Emperor Xuanzong and Song Emperor Ningzong died, succeeded by Emperor Aizong of Jin and Emperor Lizong of Song. Meanwhile, Genghis Khan had conquered the Western Xia dynasty, which the Jin had refused to aid. Before his death in 1227, Genghis Khan left a final strategy: borrow Song territory to bypass Jin defenses and destroy the Jin completely.
His successor, Ogedei Khan, executed this plan. In a grand strategy meeting at Guanshan, Ogedei ordered a three-pronged attack: the central force would strike Luoyang, the left would attack Jinan, and the right, led by his brother Tolui, would outflank the Jin by marching through Song territory. The Song, harboring deep hatred for the Jin and ignoring warnings from officials like Qiao Xingjian about the Mongol threat, not only allowed Tolui’s army to pass but provided them with supplies. The maneuver succeeded; the Jin capital of Kaifeng fell, and Emperor Aizong fled first to Guide and then to Caizhou.
The Fall of Caizhou and the End of the Jin
In 1234, Ogedei sent envoy Wang Ji to Lin’an, proposing a joint attack on Caizhou. He promised that upon the Jin’s destruction, the Song would regain all territories south of the Yellow River. Tempted by the prospect of reclaiming lost lands and avenging century-old humiliations, Emperor Lizong agreed, disregarding Emperor Aizong’s desperate plea that “once the Jin is gone, the Song will be next.”
The allied forces besieged Caizhou. The Mongols attacked the west gate, while the Song attacked the south. Cut off from supplies, the city fell quickly. Facing inevitable capture, Emperor Aizong lamented, “I have ruled for ten years without major fault, yet I am the one who loses the nation.” He committed suicide, marking the end of the Jin Dynasty after 120 years. The Song court celebrated wildly, displaying Aizong’s remains before the spirits of the captured Emperors Huizong and Qinzong. However, as the Song prepared to reclaim Henan, they remained unaware that the Mongols had no intention of honoring their promise, setting the stage for the next tragic chapter in Chinese history.
Note
Genghis Khan (Temujin)
Founder of the Mongol Empire, who launched the decisive invasion of the Jin.
Ogedei Khan
Genghis Khan’s successor, who executed the plan to destroy the Jin with Song help.
Emperor Aizong of Jin
The last Jin emperor, who committed suicide when Caizhou fell.
Emperor Lizong of Song
Southern Song ruler who allied with the Mongols to annihilate the Jin.
Shi Miyuan
Song minister who assassinated Han Tuozhou and sent his head to the Jin for peace.
Xin Qiji
Patriotic poet-general who died regretting the Song’s weak resistance against the Jin.
Mongol Empire
A vast nomadic empire that conquered from East Asia to Europe.
Southern Song & Jin
Long‑term rivals; the Jin occupied northern China, the Song ruled the south.
Caizhou Campaign (1234)
The final battle where Mongol–Song forces ended the Jin Dynasty.
Buffer State
A country between two powers; the Jin protected the Song from the Mongols.
“Lips and teeth are interdependent”
A proverb warning that if the Jin (lips) fell, the Song (teeth) would soon perish too.
Short‑sighted alliance
The Song’s fatal choice to help destroy the Jin, ignoring the greater Mongol threat.
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