Zorah, Aijalon, and Hebron, fortified cities that are in Judah and in Benjamin.
How the ten tribes deserted the house of David we read in the foregoing chapter. They had formerly sat loose to that family (Sa2 20:1, Sa2 20:2), and now they quite threw it off, not considering how much it would weaken the common interest and take Israel down from that pitch of glory at which it had arrived in the last reign.
Commenting on 2 Chronicles 11:1-12
And in every several city he put shields and spears,.... Furnished them with these and perhaps other pieces of armour, these being put for all, to defend themselves with against an enemy, and to annoy them: and made them exceeding strong; so that they could not be easily taken: having Judah and Benjamin on his side: which tribes cleaved to one another, and to Rehoboam...
2Ch 11:10 Zorah, Samson’s birthplace, is represented by the ruin Sura, at the south-west end of the ridge, which encloses the Wady es Surar on the north; see on Jos 15:33. To the north of that again lay Ajalon, now the village Jâlo, on the verge of the plain Merj ibn Omeir, four leagues to the west of Gibeon; see on Jos 10:12 and Jos 19:42.