Battle of Xuantu (121) — the same event in Book of the Later Han and Samguk Sagi

Book of the Later Han: Goguryeo, Mahan and Yemaek besieged the Xuantu castle; the King of Buyeo sent his son to join in the attack and crushed them…

What each source says

Book of the Later Han (Hou Hanshu), Annals · AD 121 · 玄菟

Goguryeo, Mahan and Yemaek besieged the Xuantu castle; the King of Buyeo sent his son to join in the attack and crushed them.

冬十二月,高句驪、馬韓、穢貊圍玄菟城,夫餘王遣子與州郡并力討破之。
Location: 後漢書卷5 孝安帝紀 建光1年

Samguk Sagi (History of the Three Kingdoms) · AD 121

The king surrounded Xuantu fortress with more than ten thousand cavalry from Mahan and Yemaek, but was badly defeated by Buyeo's relief army. tradition

十二月,王率馬韓、穢貊一萬餘騎,進圍玄菟城。
Location: 卷15 太祖大王 69年

Where the sources differ

A and B are two of the sources listed above.

On what pointSource ASource BWhat differs (in Korean)
NumbersBook of the Later Han (Hou Hanshu), AnnalsSamguk Sagi (History of the Three Kingdoms)b 1만여 기 / a는 수를 적지 않음

Place: 玄菟

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