The two battles here mentioned, one with Rezin (king of Syria), and the other with Pekah (king of Israel) are additions to the narrative of the writer of Kings (marginal reference “g”). The events of the Syro-Israelite war were probably spread over several years.
Related Commentaries of 2 Chronicles 28:5
2 Chronicles 28:5
5 Wherefore the LORD his God delivered him into the hand of the king of Syria; and they smote him, and carried away a great multitude of them captives, and brought them to Damascus.b And he was also delivered into the hand of the king of Israel, who smote him with a great slaughter.