Charles Ellicott Commentary 2 Chronicles 17:2

"And he placed forces in all the fortified cities of Judah, and set garrisons in the land of Judah, and in the cities of Ephraim, which Asa his father had taken." — 2 Chronicles 17:2 (ASV)

And he placed forces. —Compare 2 Chronicles 11:12.

The fenced cities. —‘ Arê ha-bĕtsûrôth. (Compare 2 Chronicles 11:5 and following, 2 Chronicles 14:6–7.)

And set garrisons. — Placed military posts or prefects (netsîbîm). (1 Chronicles 11:16; 2 Chronicles 11:11.) Syriac, “appointed rulers.”

The cities of Ephraim ... had taken. —See on 2 Chronicles 15:8.