section_path: Early reign: reforms and Chinese campaigns (1206–1215)/Campaign against the Jin (1211–1215)
section_name: Campaign against the Jin (1211–1215)
paragraph_text: Campaign against the Jin (1211–1215)
  
  Wanyan Yongji usurped the Jin throne in 1209. He had previously served on the steppe frontier and Genghis greatly disliked him. When asked to submit and pay the annual tribute to Yongji in 1210, Genghis instead mocked the emperor, spat, and rode away from the Jin envoy—a challenge that meant war. Despite the possibility of being outnumbered eight-to-one by 600,000 Jin soldiers, Genghis had prepared to invade the Jin since learning in 1206 that the state was wracked by internal instabilities. Genghis had two aims: to take vengeance for past wrongs committed by the Jin, foremost among which was the death of Ambaghai Khan in the mid-12th century, and to win the vast amounts of plunder his troops and vassals expected.
  
  After calling for a kurultai in March 1211, Genghis launched his invasion of Jin China in May, reaching the outer ring of Jin defences the following month. These border fortifications were guarded by Alaqush's Ongud, who allowed the Mongols to pass without difficulty. The three-pronged chevauchée aimed both to plunder and burn a vast area of Jin territory to deprive them of supplies and popular legitimacy, and to secure the mountain passes which allowed access to the North China Plain. The Jin lost numerous towns and were hindered by a series of defections, the most prominent of which led directly to Muqali's victory at the Battle of Huan'erzhui in autumn 1211. The campaign was halted in 1212 when Genghis was wounded by an arrow during the unsuccessful siege of Xijing (modern Datong). Following this failure, Genghis set up a corps of siege engineers, which recruited 500 Jin experts over the next two years.
  
  The defences of Juyong Pass had been strongly reinforced by the time the conflict resumed in 1213, but a Mongol detachment led by Jebe managed to infiltrate the pass and surprise the elite Jin defenders, opening the road to the Jin capital Zhongdu (modern-day Beijing). The Jin administration began to disintegrate: after the Khitans, a tribe subject to the Jin, entered open rebellion, Hushahu, the commander of the forces at Xijing, abandoned his post and staged a coup in Zhongdu, killing Yongji and installing his own puppet ruler, Xuanzong. This governmental breakdown was fortunate for Genghis's forces; emboldened by their victories, they had seriously overreached and lost the initiative. Unable to do more than camp before Zhongdu's fortifications while his army suffered from an epidemic and famine—they resorted to cannibalism according to Carpini, who may have been exaggerating—Genghis opened peace negotiations despite his commanders' militance. He secured tribute, including 3,000 horses, 500 slaves, a Jin princess, and massive amounts of gold and silk, before lifting the siege and setting off homewards in May 1214.
  
  As the northern Jin lands had been ravaged by plague and war, Xuanzong moved the capital and imperial court 600 kilometres (370 mi) southwards to Kaifeng. Interpreting this as an attempt to regroup in the south and then restart the war, Genghis concluded the terms of the peace treaty had been broken. He immediately prepared to return and capture Zhongdu. According to Christopher Atwood, it was only at this juncture that Genghis decided to fully conquer northern China. Muqali captured numerous towns in Liaodong during winter 1214–15, and although the inhabitants of Zhongdu surrendered to Genghis on 31 May 1215, the city was sacked. When Genghis returned to Mongolia in early 1216, Muqali was left in command in China. He waged a brutal but effective campaign against the unstable Jin regime until his death in 1223.