And he went forth, and warred against the Philistines,.... Who in the times of Jehoram broke in upon Judah, and distressed them, Ch2 21:16. and brake down the wall of Gath; which was one of the five principalities of the Philistines: and the wall of Jabneh; nowhere else mentioned in Scripture, but frequent in the Jewish writings; where the sanhedrim sometimes sat, and where was a famous university, and from whence sprung many of the Jewish rabbins; it is the same which in some writers is called Jamnia, and was a port near to Joppa; and belonged to the tribe of Dan, as Josephus (m) writes: and the wall of Ashdod: another of the principalities of the Philistines, the same with the Azotus of the New Testament; he dismantled all these places: and built cities about Ashdod, and among the Philistines; where he placed garrisons to keep them in awe; see Amo 1:8. (m) Antiqu. l. 5. c. 9. sect. 22.