1232, Renchen year (the Year of the Loong), Song Shaoding five years, Jin Zhengda nine years, Xing Kai first year, Tianxing first year, Mongolian Wokuotai Khan four years. In A.D. 1232, the Song and Meng allied forces besieged Kaifeng, an important city. After adowa 8 jin j tens of thousands, breached the city, Jin Aizong fled to Cai Zhou. In Song Dynasty, Meng Gong led the army to the Northern Expedition, and successively attacked Dengzhou and Shenzhou. Song Jun defeated the army of more than 65.438 million people in Shanxi and Xi 'an in stirrup mountain, "reducing 70,000 people". Song Jun immediately conquered Tang Zhou, completely cut off the rulers of the posterior. In A.D. 1233, Song Jun arrived at the gates of Caizhou and joined forces with the Mongols. Jin Aizong, Hong Yan, who kept the emptiness and didn't want to be the last emperor, committed suicide after passing the throne to Hong Yan Cheng Lin. Later, the Song Dynasty and the Mongols joined forces to attack Cai Zhou.