12 events the sources record for this year, grouped by region.
What happened
China (9)
Mongol troops took Taiyuan Prefecture; Left Military Supervisor Wugulun Desheng died in battle. (History of Jin (Jinshi), Annals 金史 卷015 宣宗 興定二年9月)
Li Quan broke Mizhou and captured Pacification Deputy Envoy Huang Guo'alu da and others. (History of Jin (Jinshi), Annals 金史 卷015 宣宗 興定二年9月)
Mongol troops took Pingyang; Prefect Affairs and Acting Provincial Secretariat official Li Ge and Cong Tan died. (History of Jin (Jinshi), Annals 金史 卷015 宣宗 興定二年10月)
Mongol troops took Luzhou; Right Military Supervisor Nahe Pulaodu and others died. (History of Jin (Jinshi), Annals 金史 卷015 宣宗 興定二年11月)
Pusan Anzhen was appointed Left Deputy Marshal and entrusted with the campaign against the Song. (History of Jin (Jinshi), Annals 金史 卷015 宣宗 興定二年12月)
Liu Changzu burned Xihezhou and fled; the garrison official Yang Kejia also abandoned the city. (History of Song (Songshi), Annals 宋史卷040 嘉定十一年)
Muhuali entered Hedong from the Western Capital and captured Taiyuan, Pingyang, and the prefectures of Xin, Dai, Ze, Lu, Fen, and Huo. (History of Yuan (Yuanshi), Annals 元史 卷1 太祖 1218年)
When the Khitan leader Liuge seized Gangdong Fortress of Goryeo, Hazhen and Zhala suppressed it, and the king of Goryeo surrendered and agreed to send tribute every year. (History of Yuan (Yuanshi), Annals 元史 卷1 太祖 1218年)
In the first month, reinforcements from Xu Guo of Suizhou reached Baishui, so close that drums could be heard from one to the other; when Zong Zheng led several generals out to fight, the Jin army collapsed and fled. (Xu Zizhi Tongjian (Continuation of the Comprehensive Mirror) 권161 正月 단락161.7.6)
Korean Peninsula (3)
Garrison troops of the Seohae Route fight the Khitan remnant army at Gokju and cut off more than 300 heads. (Goryeosa (History of Goryeo) 世家 卷22 高宗 五年)
The Mongol commanders Hap-jin and Chal-lal and the Eastern Jin force of Wanyan Ja-yeon, citing the suppression of the Khitan remnants, defeat the four castles of Hwa, Maeng, Sun and Deok and head for Gangdong Fortress. (Goryeosa (History of Goryeo) 世家 卷22 高宗 五年)
December 1218: Mongol commanders Hajin and Chala with 10,000 men and Jin's Wanyan Ziyan with 20,000, claiming to attack the Khitan, break the four fortresses of Hwa, Maeng, Sun and Deok and head straight for Gangdongseong; heavy snow cuts off their provisions (Goryeosa Jeolyo (Essentials of Goryeo History) 권15 高宗 五年)