He also built cities in the hill country of Judah and fortresses and towers in the forests.
There is not much more related here concerning Jotham than we had before, Kg2 15:32, etc. I. He reigned well. He did that which was right in the sight of the Lord; the course of his reign was good, and pleasing to God, whose favour he made his end, and his word his rule, and (which shows that he acted from a good principle) he...
Commenting on 2 Chronicles 27:1-9
He fought also with the king of the Ammonites, and prevailed against them,.... These were brought into subjection by David; but in later times endeavoured to cast off the yoke, and even invaded the land of Judah, as in the days of Jehoshaphat, and now in the reign of Jotham, but succeeded not, see Amo 1:13.
in the mountains of Judah, and in the forests he built castles and towers--that is, in the elevated and wooded spots where fortified cities could not be placed, he erected castles and towers.