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Xu Xian, who called himself the King of Heaven, originally intended to capture the Beijing city of Damingfu and cut off the retreat route of the Jin army. Presumably, when the Jin army learned that their retreat route had been cut off, they would go all out and concentrate their troops to counterattack the Beijing city of Damingfu. This would achieve the strategic intention of "encircling Wei to save Zhao" and distract the Jin army from encircling and advancing to attack the city of Dongjing Bianliang, thus avoiding the crisis of the city of Dongjing Bianliang being captured and millions of Song people being harmed.

Unexpectedly, after Wanyan Zongfu set off a smoke signal for help, the Jin army's emergency messengers along the way were intercepted by the cavalry reconnaissance team led by Yue Fei, and they accidentally blocked the military intelligence that the city of Beijing in Damingfu had been captured.

Afterwards, Xu Xian sent out numerous reconnaissance teams to spy on military intelligence in various places in case of emergency.

However, Zhao Gou, the King Kang and the Grand Marshal of the Song Dynasty, was passive and gave up resistance. He was not willing to send troops to rescue Song Huizong and Song Qinzong, who were besieged in Tokyo Bianliang. He only wanted his own safety and had already fled to Nanjing Yingtian Prefecture (now Shangqiu, Henan). However, he still spent his days in debauchery and having a great time.

At this time, the famous general Zong Ze, who was a war faction in the Zhao Song court, was assigned by Kang Wang Zhao Gou to attack Kaide Prefecture (now Puyang, Henan) in order to cut off the retreat of the Jin army and relieve the siege of Dongjing. This shows that Kang Wang Zhao Gou was very far-sighted. Why couldn't he take measures to relieve or protect the safety of Dongjing Bianliang? Obviously, he had something to hide, and the fundamental reason was that he coveted the throne of the Song Dynasty!

Under the deliberate and calculated arrangement of the wise man Zhao Gou, his entourage retreated smoothly all the way south and arrived safely in Nanjing Yingtian Prefecture (Shangqiu). However, Zhao Gou left Tokyo Bianliang unattended and it was captured by the Jin army, leading to the demise of the Northern Song Dynasty.

At this time, volunteer armies from all over the country came to support the king, and their numbers kept increasing. Famous generals such as Han Shizhong and Liu Guangshi were among them. Zhao Gou had a large number of soldiers and horses at that time, and had gathered millions of people. But even so, Zhao Gou only cared about his own safety. He wanted to flee to the south of the Yangtze River to proclaim himself emperor and establish his own small court. If it were not for the strong opposition in the army, he would have fled to the south of the Yangtze River long ago.

On the first day of May, Zhao Gou officially ascended the throne in Nanjing Yingtianfu (now Shangqiu, Henan) and rebuilt the Song Dynasty as Emperor Gaozong of Song, changing the reign title to Jianyan. At this time, the Song Dynasty still controlled most of the territory south of the Yellow River.

After Zhao Gou proclaimed himself emperor, he was worried that the pro-war faction would defeat the Jin army and bring back Song Huizong and Song Qinzong, his father and brother, and threaten his throne, so he intended to withdraw his troops to the south of the Yangtze River, completely disregarding the lives of the people. Huang Qianshan, Wang Boyan and other pro-peace factions immediately followed his wishes and encouraged Zhao Gou to go south, but they were stopped by the turmoil in the southeast and temporarily stayed in Yangzhou.

After the Jingkang Incident, the Jin army returned north with all kinds of looted materials and equipment, as well as the two emperors Song Huizong and Song Qinzong, as well as a large number of people and craftsmen, intending to build their own northeastern base camp.

After Xu Xian learned about the Jin army's return to the north, he immediately arranged for Niu Gao to lead 50,000 infantry troops to station troops on the north bank of the Zhang River, build blockhouses and other military facilities, and comprehensively block the Jin army. He also ordered Yue Fei to lead 10,000 cavalry troops to hide in Xiangzhou (Anyang, Henan) on the south bank of the Zhang River, waiting for the Jin army to gather on the south bank of the Zhang River and be blocked, and then launch a fatal attack from the two wings and the rear, and on the premise of ensuring their own safety, look for opportunities to rescue the people and materials looted by the Jin.