Huguan (206) — the same event in Records of the Three Kingdoms and Zizhi Tongjian

Records of the Three Kingdoms: Cao Cao besieged Huguan for three months and took it; Gao Gan fled to Jingzhou but was captured at Shangluo and…

What each source says

Records of the Three Kingdoms (Sanguozhi) · AD 206 · 壺關

Cao Cao besieged Huguan for three months and took it; Gao Gan fled to Jingzhou but was captured at Shangluo and killed.

公圍壺關三月,拔之。
Location: 魏書 武帝紀 (卷01) 建安11년

Zizhi Tongjian (Comprehensive Mirror) · AD 206 · 壺關

Cao Cao attacked Gao Gan in person and ordered his heir Pi to guard Ye. He besieged Huguan and in the third month it surrendered; Gao Gan asked the Xiongnu for relief, but the Chanyu did not accept, and as he tried to flee south to Jingzhou he was caught by Wang Yan, Commandant of Shangluo, and killed, pacifying Bingzhou.

操圍壺關,三月,壺關降。
Location: 資治通鑑 卷065 (원문 단락 #5248, 206년)

Place: 壺關

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