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Jingkang incident

Part of the Jin–Song wars (1127)

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This event marked the collapse of the Northern Song dynasty that originally controlled most of China proper. Some members of the Song imperial family, most notably Zhao Gou (later Emperor Gaozong), managed to escape to southern China, where they reestablished the Song dynasty (known in historiography as the Southern Song dynasty), with the new capital in Lin'an (present-day Hangzhou, Zhejiang). The event also greatly contributed to the return of the descendants of Emperor Taizu to the line of succession, as most of Emperor Taizong's descendants were abducted and Emperor Gaozong failed to produce an heir.

Because it took place during the Jingkang era of Emperor Qinzong's reign, it became known as the "Jingkang Incident".

Background

In 1120, under the Alliance Conducted at Sea, the Jin and Song dynasties agreed to form a military alliance against the Liao dynasty and, if victorious, divide up the Liao territories. The Jin would get a large portion of the northern region and the Song would get a smaller portion in the southern area known as the Sixteen Prefectures.

Led by Tong Guan, the Song army marched to the Song–Liao border and was stopped by the defensive forest that the Song had maintained since the reign of Emperor Taizu. In order to pass through, Tong Guan ordered the soldiers to clear the forest and continued the expedition into the Liao.

The Jin army sacked the Liao capital of Shangjing (present-day Bairin Left Banner, Inner Mongolia) and ended the Liao dynasty. The Song army in the south, however, could not even penetrate Liao's defensive positions and the army was defeated by the remaining Liao troops afterwards. This exposed the limitations of the Song army as well as the corruption and inefficiency in the Song imperial court. In the end, the Jin took control of all former Liao territories.

After the Liao dynasty's fall, the Song wanted the Sixteen Prefectures as promised. The Jin sold the land at a price of 300,000 bolts of silk and 200,000 ounces of silver. This price was considered extremely generous as it was the tribute the Song had already been paying to the Liao annually since the Chanyuan Treaty of 1005.

Prelude to the war

According to the Twenty-Four Histories, in 1123, three years after the fall of the Liao, a Jin general named Zhang Jue (张觉) defected to the Song. He was governor of the Jin-controlled Pingzhou Prefecture (present-day Zunhua, Hebei), which was within the Great Wall, but not counted among the Sixteen Prefectures. Nonetheless, the Song imperial court initially welcomed the defection and awarded Zhang Jue a title and property. The Jin, on the other hand, sent a small army aiming to overturn the defection but was defeated by Zhang Jue's troops.

In 1123 or 1124 (records differ), the Jin sent diplomats for Zhang Jue and sacked three Song cities. Panicking, Song general Wang Anzhong killed someone who looked similar to Zhang Jue and sent the head to the Jin, who realized it was a ruse and attacked the Song again. Zhang Jue was eventually executed in the winter of the same year. This came too late: in the fall of 1125, Emperor Taizong of Jin issued an order to launch a full-scale attack on Song territories.

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