Baima (200) — the same event in Records of the Three Kingdoms and Zizhi Tongjian

Records of the Three Kingdoms: At Baima, Cao Cao sent Zhang Liao and Guan Yu ahead, beheaded Yan Liang, and lifted the siege of Baima.; Zizhi…

What each source says

Records of the Three Kingdoms (Sanguozhi) · AD 200 · 白馬

At Baima, Cao Cao sent Zhang Liao and Guan Yu ahead, beheaded Yan Liang, and lifted the siege of Baima.

使張遼、關羽前登，擊破，斬良。
Location: 魏書武帝紀 (卷01) 建安5년

Zizhi Tongjian (Comprehensive Mirror) · AD 200 · 白馬

Yuan Shao sent Yan Liang to attack Liu Yan, the Governor of Dongjun, at Baima. Ju Shou warned that Yan Liang was hasty and should not be left alone, but was not heeded. In the fourth month Cao Cao marched north to rescue Liu Yan, and Xun Yu proposed a diversion at Yanjin.

袁紹遣其將顏良攻東郡太守劉延於白馬，沮授曰：「良性促狹，雖驍勇，不可獨任。
Location: 資治通鑑卷063 (원문 단락 #5176, 200년)

Place: 白馬

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