Battle of Guandu
After a long standoff between Cao Cao and Yuan Shao, Xu You defected and exposed the supply depot at Wuchao. Cao's raid on Chunyu Qiong's grain force became the turning point in the contest for northern China.
Participants
Textual evidence
Every quotation below is matched verbatim against the local public-domain corpus during the build. It supports the event outline; it does not exhaust every interpretation.
“会许攸来降，言绍遣淳于琼等将万餘兵迎运粮，将骄卒惰，可要撃也。”