John Gill Commentary 2 Chronicles 28:17

"For again the Edomites had come and smitten Judah, and carried away captives." — 2 Chronicles 28:17 (ASV)

For again the Edomites had come
As in the days of Jehoshaphat, (2 Chronicles 20:10) ,

and smitten Judah, and carried away captives ;
taking the advantage of the weak and low condition Ahaz was in, and which was the reason of his sending to the king of Assyria.