Charles Ellicott Commentary 2 Chronicles 12:4

"And he took the fortified cities which pertained to Judah, and came unto Jerusalem." — 2 Chronicles 12:4 (ASV)

He took the fenced cities. —Those very cities which Rehoboam had fortified as bulwarks against Egypt (2 Chronicles 11:5–12). Fourteen names of cities have disappeared from the Karnak inscription, but Socho, Adoraim, and Ajalon are still read there.

Came to (so far as to) Jerusalem. —Compare to Isaiah 36:1-2. The verse is not in Kings. Thenius (on 1 Kings 14:26) says that the chronicler has here made use of “really historical notices.” It is self-evident.