Mongol conquest of the Jin dynasty

The Yehuling Campaign of 1211 — encompassing the Battle of Huihe River, the battles at Wild Fox Ridge, and the Battle of Badger Mouth — was a major engagement in the first stage of the Mongol conquest of the Jin dynasty. Fought in the northwest of what is now Wanquan District, Zhangjiakou, Hebei Province, it pitted a Mongol force of 65,000 under Genghis Khan against a Jin army reported at 600,000. The campaign concluded with a Mongol victory and is recorded as hastening the decline of the Jin dynasty, marking it as one of the consequential early engagements of a conquest that would ultimately end Jin rule by 1234.

The fall of Zhongdu in 1215 marked a decisive blow to Jin authority in northern China during the Mongol conquest of the Jin dynasty. The city, capital of the Jin dynasty and located in present-day Beijing, was progressively isolated by Mongol forces under Genghis Khan following earlier incursions into Jin territory. The relocation of the Jin court to Kaifeng before the city's fall was itself a significant concession, removing the imperial administration from the traditional seat of Jin power. Zhongdu endured a prolonged blockade and famine before surrendering, and its fall accelerated the dynasty's decline. The loss of the capital underscored the Jin dynasty's inability to defend its core territories against sustained Mongol pressure and signaled the broader erosion of Jin control over northern China that would define the remaining decades of the conquest.