Genghis Khan launched a full-scale invasion of the Tangut-led Western Xia, beginning the first major phase (1209–1210) of Mongol operations in northwest China that would later culminate in Western Xia’s destruction.
After advancing through Western Xia territory, Mongol forces reached and besieged the capital Yinchuan; the campaign ended with Western Xia’s submission and vassalage, securing the Mongols’ northwest flank before deeper wars in North China.
Genghis Khan’s forces crossed into Jin territory and initiated the long Mongol–Jin conflict. This marked the start of sustained Mongol campaigning in northern China (1211–1234).
At Yehuling (Wild Fox Ridge), Mongol armies won a decisive series of engagements that shattered major Jin field forces and opened routes into North China, accelerating the Jin’s strategic collapse in the north.
Facing renewed Mongol pressure, the Jin emperor moved the capital away from Zhongdu (modern Beijing) to Kaifeng, reflecting the shrinking defensive perimeter and the growing vulnerability of the northern capital region.
The Mongols captured Zhongdu after a multi-year siege, depriving the Jin of a key political and logistical center and confirming Mongol dominance across much of the north.
Genghis Khan returned to war against Western Xia (1225–1227), aiming to punish defiance and eliminate the Tangut state that could threaten Mongol rear areas during operations in northern China.
Genghis Khan died in August 1227 while the Western Xia campaign was still underway; succession passed to Ögedei after a regency, with Mongol strategy continuing toward the final conquest of the Jin.
The Mongols captured Western Xia’s capital region and ended the dynasty, removing a major regional power in northwest China and freeing Mongol capacity for renewed large-scale operations against the Jin.
After consolidating authority, Ögedei personally led major campaigning against the Jin, pushing the war into a decisive phase that would culminate in the fall of Kaifeng and the Jin state.
Fighting at Daohuigu (late 1230 and early 1231) included one of the rare recorded setbacks for Subutai’s forces in the Jin theater, illustrating that Jin armies could still win important tactical engagements even as overall momentum shifted to the Mongols.
Tolui’s forces defeated the Jin at Sanfengshan (Three-Peak Mountain), a pivotal Mongol victory that effectively eliminated the Jin’s remaining large field army and paved the way for sieges of major cities.
Mongol armies closed on Kaifeng and began a major siege in 1232. Contemporary accounts emphasize the defenders’ use of gunpowder weapons (e.g., bomb-like projectiles), while Mongol pressure and blockade conditions drove the city toward collapse.
After prolonged siege conditions (famine and disease among them), Kaifeng fell in 1233. The Jin emperor fled, and the war moved toward its final act as Mongol forces closed on the remnants of Jin power.
Mongol forces, allied with the Southern Song, besieged Caizhou, the Jin’s last major stronghold. The alliance was decisive in concentrating manpower and accelerating the end of the Jin dynasty.
Caizhou fell on 1234-02-09. Emperor Aizong committed suicide during the final crisis; his successor (Emperor Mo) died the same day, marking the formal end of the Jin dynasty and completing the Mongol conquest of northern China’s Jin state.
Jin and Western Xia Wars in Northern China (1211–1234)
