Albert Barnes Commentary 2 Chronicles 26:6

"And he went forth and warred against the Philistines, and brake down the wall of Gath, and the wall of Jabneh, and the wall of Ashdod; and he built cities in [the country of] Ashdod, and among the Philistines." — 2 Chronicles 26:6 (ASV)

Uzziah’s expedition was the natural sequel to the Edomite war of Amaziah (2 Chronicles 25:11), which crushed the most formidable of all the tribes of the south. On Jabneh, see the note on Joshua 15:11; and on Ashdod, see the note on Joshua 13:3.