Longmen (571) — the same event in History of the Northern Dynasties and Book of Zhou

History of the Northern Dynasties: Duke Qi Yuwen Xian crossed the Yellow River at Longmen, drove Hulü Guang back to Huagu, and took five newly built…

What each source says

History of the Northern Dynasties (Beishi), Annals · AD 571 · 龍門

Duke Qi Yuwen Xian crossed the Yellow River at Longmen, drove Hulü Guang back to Huagu, and took five newly built walls.

齊公憲自龍門度河,斛律光退保華谷,憲攻拔其新築五城
Location: 北史 卷10 天和6年

Book of Zhou (Zhoushu), Imperial Annals · AD 571 · 龍門

When Yuwen Xian crosses the Yellow River at Longmen, Hulü Mingyue retreats to Huagu, and the five newly built cities fall

三月己酉,齊國公憲自龍門度河,斛律明月退保華谷,憲攻拔其新築五城。
Location: 周書 卷5 天和6年3月

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