And set garrisons in the cities which Asa had taken We do not read of any cities which Asa took; but Abijah his father possessed himself of several, which Asa kept and took for his own, 2 Chronicles 13:19. And, it appears, Jehoshaphat put such forces in them as might secure them to himself.
Related Commentaries of 2 Chronicles 17:2
2 Chronicles 17:2
2 And he placed forces in all the fenced cities of Judah, and set garrisons in the land of Judah, and in the cities of Ephraim, which Asa his father had taken.