Gath had been taken by Hazael in the days of Joash his grandfather, 2 Kings 12:17, but was either relinquished by him, because it lay so far from his other dominions; or retaken by the Philistines, who had now repaired its fortifications, and kept it.
Related Commentaries of 2 Chronicles 26:6
2 Chronicles 26:6
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 built cities about Ashdod, and among the Philistines.