Although the Aramean army had come with only a few men, the LORD delivered into their hand a very great army. Because Judah had forsaken the LORD, the God of their fathers, judgment was executed on Joash.
Though the Aramean army is small, the LORD gives a very great army into its hand because Judah has forsaken the LORD, and judgment falls on Joash.
It explains the invasion as divine judgment rather than military strength.
23In the spring, the army of Aram went to war against Joash. They entered Judah and Jerusalem and destroyed all the leaders of the people, and they sent all the plunder to their king in Damascus. 24Although the Aramean army had come with only a few men, the LORD delivered into their hand a very great army. Because Judah had forsaken the LORD, the God of their fathers, judgment was executed on Joash. 25And when the Arameans had withdrawn, they left Joash severely wounded. His own servants conspired against him for shedding the blood of the son of Jehoiada the priest, and they killed him on his bed. So he died and was buried in the City of David, but not in the tombs of the kings. 26Those who conspired against Joash were Zabad son of Shimeath the Ammonitess and Jehozabad son of Shimrith the Moabitess. 27The accounts of the sons of Joash and the many pronouncements about him, and of the restoration of the house of God, are indeed written in the Treatise of the Book of the Kings. And his son Amaziah reigned in his place.