Battle of Mayi (582) — the same event in History of the Northern Dynasties and Book of Sui
History of the Northern Dynasties: Li Chong defeated the Tujue at Mayi.; Book of Sui: Li Chong, Pillar of State, defeated the Turks at Mayi.
What each source says
Li Chong defeated the Tujue at Mayi.
乙酉，上柱國李充破突厥於馬邑
Location: 北史 卷11 開皇2年
Li Chong, Pillar of State, defeated the Turks at Mayi.
上柱國李充破突厥於馬邑
Location: 隋書 卷001 帝紀 開皇2年6月
Place: 馬邑
Show on the map — open History of the Northern Dynasties (Beishi), Annals