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The Mongol conquest of China
Genghis Khan rose to supremacy over the Mongol tribes in the steppe in 1206, and within a few years he attempted to conquer northern China. By securing in 1209 the allegiance of the Tangut state of Xi (Western) Xia in what are now Gansu, Ningxia, and parts of Shaanxi and Qinghai, he disposed of a potential enemy and prepared the ground for an attack against the Jin state of the Juchen in northern China. At that time the situation of Jin was precarious. The Juchen were exhausted by a costly war (1206–08) against their hereditary enemies, the Nan (Southern) Song. Discontent among the non-Juchen elements of the Jin population (Chinese and Khitan) had increased, and not a few Chinese and Khitan nobles defected to the Mongol side. Genghis Khan, in his preparation for the campaign against Jin, could therefore rely on foreign advisers who were familiar with the territory and the conditions of the Jin state.
Invasion of the Jin state
The Mongol armies started their attack in 1211, invading from the north in three groups; Genghis Khan led the center group himself. For several years they pillaged the country; finally, in 1214 they concentrated on the central capital of the Jin, Zhongdu (present-day Beijing). Its fortifications proved difficult to overcome, so the Mongols concluded a peace and withdrew. Shortly afterward the Jin emperor moved to the southern capital at Bianjing (present-day Kaifeng). Genghis Khan considered this a breach of the armistice, and his renewed attack brought large parts of northern China under Mongol control and finally resulted in 1215 in the capture of Zhongdu (renamed Dadu in 1272). The Mongols had had little or no experience in siege craft and warfare in densely populated areas; their strength had been chiefly in cavalry attacks. The assistance of defectors from the Jin state probably contributed to this early Mongol success. In subsequent campaigns the Mongols relied even more on the sophisticated skills and strategies of the increased number of Chinese under their control.
After 1215 the Jin were reduced to a small buffer state between the Mongols in the north and Song China in the south, and their extinction was but a matter of time. The Mongol campaigns against Xi Xia in 1226–27 and the death of Genghis Khan in 1227 brought a brief respite for Jin, but the Mongols resumed their attacks in 1230.
The Song Chinese, seeing a chance to regain some of the territories they had lost to the Juchen in the 12th century, formed an alliance with the Mongols and besieged Bianjing in 1232. Aizong, the emperor of Jin, left Bianjing in 1233, just before the city fell, and took up his last residence in Cai prefecture (Henan), but that refuge was also doomed. In 1234 the emperor killed himself, and organized resistance ceased. The southern border of the former Jin state—the Huai River—now became the border of the Mongol dominions in northern China.