6 events the sources record for this year, grouped by region.
What happened
China (3)
Zhang Zhongwu, commander of the Xiongwu Army, entered Youzhou and took control of the Lulong Army. (New Book of Tang (Xin Tangshu), Annals 新唐書 卷008 穆宗~宣宗 會昌1年10月)
A mutiny in the Lulong army kills the military governor Shi Yuanzhong, and Chen Xingtai takes charge of military affairs. (Zizhi Tongjian (Comprehensive Mirror) 資治通鑑 卷246)
Wuje Khagan attacks the envoys, kills Dagan, takes Princess Taihe as a hostage, crosses the desert and camps near the frontier of Tiande Garrison. (Zizhi Tongjian (Comprehensive Mirror) 資治通鑑 卷246)
Japan (3)
In the second month, the Silla man Jang Bogo's gift of saddles, presented at the end of the twelfth month of last year, was judged a tribute offered without authority by another court's minister; by protocol it was refused and returned, but the accompanying goods were allowed private trade. (Shoku Nihon Kōki 續日本後紀 卷第十 (원문 16번째 단락))
In the ninth month, floods swept away people's houses; the bridges of the capital and the Yamazaki Bridge were all washed away. (Shoku Nihon Kōki 續日本後紀 卷第十 (원문 64번째 단락))
In the twelfth month, Nagato Province reported the arrival of a Bohai guest party of 105 people led by He Fuyan and others. (Shoku Nihon Kōki 續日本後紀 卷第十 (원문 92번째 단락))