Yangzhou (887) — the same event in Old Book of Tang, New Book of Tang and Zizhi Tongjian

Old Book of Tang: Gao Pian, Jiedushi of Huainan, was killed by his subordinate Bi Shiduo.; New Book of Tang: Bi Shiduo of Huainan captured Yangzhou…

What each source says

Old Book of Tang (Jiu Tangshu), Annals · AD 887 · 揚州

Gao Pian, Jiedushi of Huainan, was killed by his subordinate Bi Shiduo.

九月辛未朔,淮南節度使高駢為其牙將畢師鐸所殺。
Location: 舊唐書 卷19下 光啟3年 9月

New Book of Tang (Xin Tangshu), Annals · AD 887 · 揚州

Bi Shiduo of Huainan captured Yangzhou and took prisoner the military governor Gao Pian.

甲子,淮南兵馬使畢師鐸陷揚州,執其節度使高駢
Location: 新唐書 卷009 懿宗·僖宗 光啟3年4月

Zizhi Tongjian (Comprehensive Mirror) · AD 887 · 揚州

Bi Shiduo's army suddenly arrives below the walls of Guangling, Yangzhou.

畢師鐸兵奄至廣陵城下,城中驚擾。
Location: 資治通鑑 卷257

Where the sources differ

A and B are two of the sources listed above.

On what pointSource ASource BWhat differs (in Korean)
OutcomeOld Book of Tang (Jiu Tangshu), AnnalsNew Book of Tang (Xin Tangshu), Annalsa는 필사탁 부하에게 살해 / b는 필사탁이 양주 함락, 고변 사로잡음

Place: 揚州

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