19 events the sources record for this year, grouped by region.
What happened
China (12)
Mongol troops and the two provincial armies fought at Sanfeng Mountain in Junzhou; the two provincial armies were utterly defeated. Heda and Chen Heshang fled to Junzhou, and when the city was broken all were killed in battle. (History of Jin (Jinshi), Annals 金史 卷017 哀宗 天興元年(開興元年)正月)
After pacifying Hezhong, Mongol troops crossed the Yellow River at Baipo in Heqing County. (History of Jin (Jinshi), Annals 金史 卷017 哀宗 天興元年正月)
Mongol troops attacked Bianjing (Kaifeng); Emperor Aizong went out to the Gate of Heavenly Succession and comforted the officers and troops of the west. (History of Jin (Jinshi), Annals 金史 卷017 哀宗 天興元年3月)
Minister of Revenue Yang Juren was sent with gold and silk to request peace from the Mongol army; on the jiazi day the era was changed to Tianxing. (History of Jin (Jinshi), Annals 金史 卷017 哀宗 天興元年4月)
Feihu Army soldier Shen Fu and others killed more than thirty Mongol envoys, including Tang Qing, at their lodging, and the peace talks were broken off. (History of Jin (Jinshi), Annals 金史 卷017 哀宗 天興元年7月)
Wanyan Silie met the Mongol army at Jingshui and was routed; Hexi abandoned his supplies and fled. (History of Jin (Jinshi), Annals 金史 卷017 哀宗 天興元年8月)
Emperor Aizong left Bianjing and headed north across the Yellow River, stationing at Huangcheng. (History of Jin (Jinshi), Annals 金史 卷018 哀宗 天興元年12月)
Song forces under Shi Songzhi and the Yuan forces jointly besieged Bianjing; the Jin ruler fled to Guide Prefecture and again to Caizhou. (History of Song (Songshi), Annals 宋史卷041 紹定五年)
Tului crushed the Jin army at Sanfeng in Junzhou and captured Jin general Pu'a; then Junzhou fell and Hada was taken alive. (History of Yuan (Yuanshi), Annals 元史 卷2 太宗 1232年 1月)
Subutai and others besieged Nanjing (Bianjing), and the Jin ruler sent his younger brother, Prince Cao E'ke, as a hostage. (History of Yuan (Yuanshi), Annals 元史 卷2 太宗 1232年 3月)
Goryeo rebelled, killed the Mongol officials stationed there, and moved to Ganghwa Island. (History of Yuan (Yuanshi), Annals 元史 卷2 太宗 1232年)
At a council of officials of the fourth rank and above, all say to hold the walls; but only the ministers Jeong Mu and Tae Jip-seong propose moving the capital to escape the disorder. (Goryeosa (History of Goryeo) 世家 卷23 高宗 十九年)
Eunuch Yun Bok-chang at Seonju tries to take the bow and arrows of the darugachi, and the darugachi shoots and kills him. (Goryeosa (History of Goryeo) 世家 卷23 高宗 十九年)
1232: Choe U gathers the high ministers to discuss moving the capital to Ganghwa; Yu Seung-dan opposes, and at night Kim Se-chung, captain of a Byeolcho unit, pushes through the gate and confronts Choe U (Goryeosa Jeolyo (Essentials of Goryeo History) 권16 高宗 十九年)
West Asia (2)
The Kitai (Jin) suddenly attacked Toqolqu, who led the rear scouting force; there was a stream and mud ahead, and forty Mongol soldiers fell into it. (Rashid al-Din, Jami' al-tawarikh (Compendium of Chronicles) 87460_djvu.txt 줄 4854–4856)
Tolui returned to his elder brother Ögedei after the battle mentioned above; the campaign having been long, the Qa'an sent Tokolu (partly damaged). (Rashid al-Din, Jami' al-tawarikh (Compendium of Chronicles) 87460_djvu.txt 줄 13369–13371)