6 events the sources record for this year, grouped by region.
What happened
China (5)
Guo Ziyi's vanguard Bai Yuanguang joined the Huihe troops and struck the Tibetans at the Lingtai Xiyuan, killing 50,000. (Old Book of Tang (Jiu Tangshu), Annals 舊唐書 卷11 永泰1年 10月)
Guo Yingyi, Jiedushi of Jiannan, was killed by his subordinate Cui Gan; neighboring prefects rose to suppress it, and Shu fell into chaos. (Old Book of Tang (Jiu Tangshu), Annals 舊唐書 卷11 永泰1年)
A joint Tibetan and Uyghur force invaded Liquan and Fengtian and the capital was placed under martial law; Guo Ziyi was stationed at Jingyang. (New Book of Tang (Xin Tangshu), Annals 新唐書 卷006 肅宗·代宗 永泰1年9月)
In intercalary October 765 (Bingyin day), Uighurs and Tubo join forces and besiege Jingyang; Guo Ziyi strictly orders his generals to guard and does not fight. (Zizhi Tongjian (Comprehensive Mirror) 권223 765년 항)
In 765 (Guiyou day), Bai Yuanguang and Yaogeluo fight at Lingtai Xiyuan and rout them, killing tens of thousands of Tubo and recovering 4,000 looted men and women. (Zizhi Tongjian (Comprehensive Mirror) 권223 765년 항)