Beiting (790) — the same event in Old Book of Tang, New Book of Tang and Zizhi Tongjian

Old Book of Tang: The Tibetans took the Beiting Protectorate, and Jiedushi Yang Xigu fled to Xizhou.; New Book of Tang: The Tibetans captured the…

What each source says

Old Book of Tang (Jiu Tangshu), Annals · AD 790 · 北庭

The Tibetans took the Beiting Protectorate, and Jiedushi Yang Xigu fled to Xizhou.

是歲,吐蕃陷北庭都護府,節度使楊襲古奔西州。
Location: 舊唐書 卷13 貞元6年

New Book of Tang (Xin Tangshu), Annals · AD 790 · 北庭

The Tibetans captured the Beiting Protectorate; the military governor Yang Xigu fled to Xizhou.

吐蕃陷北庭都護府,節度使楊襲古奔于西州
Location: 新唐書 卷007 德宗·順宗·憲宗 貞元6年

Zizhi Tongjian (Comprehensive Mirror) · AD 790 · 北庭

The people of Beiting and the Shatuo chief Zhuye Jinzhong submit to the Tibetans.

北庭人苦於回鶻誅求,與沙陀酋長朱邪盡忠皆降於吐蕃。
Location: 資治通鑑 卷233

Where the sources differ

A and B are two of the sources listed above.

On what pointSource ASource BWhat differs (in Korean)
WhoOld Book of Tang (Jiu Tangshu), AnnalsZizhi Tongjian (Comprehensive Mirror)a는 토번이 함락 / b는 북정 사람과 추장 주사진충 항복

Place: 北庭

Show on the map — open Old Book of Tang (Jiu Tangshu), Annals