Battle of Qinghai (581) — the same event in History of the Northern Dynasties and Book of Sui

History of the Northern Dynasties: Yuan Xie defeated the Tuyuhun at Qinghai and forced their submission.; Book of Sui: Acting Marshal Yuan Xie…

What each source says

History of the Northern Dynasties (Beishi), Annals · AD 581 · 青海

Yuan Xie defeated the Tuyuhun at Qinghai and forced their submission.

甲午，遣樂安公元諧擊吐谷渾於青海，破而降之
Location: 北史 卷11 開皇元年

Book of Sui (Suishu), Imperial Annals · AD 581 · 青海

Acting Marshal Yuan Xie defeated the Tuyuhun at Qinghai and forced their surrender.

遣行軍元帥樂安公元諧，擊吐谷渾於青海，破而降之
Location: 隋書 卷001 帝紀 開皇1年8月

Show on the map — open History of the Northern Dynasties (Beishi), Annals