Guabu (450) — the same event in Book of Song and Book of Wei
Book of Song: The Wei ruler led a great army and reached Guabu.; Book of Wei: He faced the Yangzi River and built a temporary palace on Mount Guabu.
What each source says
The Wei ruler led a great army and reached Guabu.
庚午，虜偽主率大眾至瓜步。
Location: 宋書 卷5 元嘉27年 12月
He faced the Yangzi River and built a temporary palace on Mount Guabu.
癸未，車駕臨江，起行宮於瓜步山。
Location: 魏書卷4下·太平真君十一年