Charles Ellicott Commentary 2 Chronicles 14:6

"And he built fortified cities in Judah; for the land was quiet, and he had no war in those years, because Jehovah had given him rest." — 2 Chronicles 14:6 (ASV)

And he built fenced cities. —See 2 Chronicles 11:5; 2 Chronicles 12:4; and for the expression had given him rest, 2 Samuel 7:1.