C. F. Keil and Franz Delitzsch on 2 Chronicles 8:5-6

2Ch 8:5-6

Besides these, he made Upper and Nether Beth-horon (see on 1Ch 7:24) into fortified cities, with walls, gates, and bars. מצור ערי is the second object of ויּבן, and וגו חומות is in apposition to that. Further, he fortified Baalah, in the tribe of Dan, to defend the kingdom against the Philistines, and, according to 1Ki 9:15-17, Hazor, Megiddo, and Gezer also, - which are omitted here, while in 1Ki 9:17 Upper Beth-horon is omitted, - and store cities, chariot cities, and cavalry cities; see on 1Ki 9:15-19.