Kaicheng (1362) — the same event in Goryeosa and Goryeosa Jeolyo

Goryeosa: With several generals attacking from all sides, Yi Seong-gye leads two thousand of his own troops as vanguard, cuts down the enemy leaders…

What each source says

Goryeosa (History of Goryeo) · AD 1362 · 개성

With several generals attacking from all sides, Yi Seong-gye leads two thousand of his own troops as vanguard, cuts down the enemy leaders Sa-yu and Guan Xiansheng and others and routs them (recovery of Gaegyeong).

乙丑,昧爽,諸將四面進攻,我太祖以麾下親兵二千人,奮擊先登,大破之,斬賊魁沙劉、關先生等。
Location: 世家 卷40 恭愍 十一年

Goryeosa Jeolyo (Essentials of Goryeo History) · AD 1362 · 開城

1362: 200,000 men under An U, Yi Bang-sil, Choe Yeong and others camp in front of Cheonsusa in the eastern suburbs under Jeong Se-un's urging. Taejo's 2,000 men crush the enemy in the vanguard, killing chiefs Sa-yu and Guan Xiansheng and beheading over 100,000; the Yuan emperor's seal is taken and the capital recovered

安祐李芳實黃裳韓方信李餘慶金得培安遇慶李龜壽崔瑩等率兵二十萬,屯東郊天壽寺前。
Location: 권27 恭愍王 十一年

Place: 開京

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