John Gill Commentary 2 Chronicles 13:18

"Thus the children of Israel were brought under at that time, and the children of Judah prevailed, because they relied upon Jehovah, the God of their fathers." — 2 Chronicles 13:18 (ASV)

Thus the children of Israel were brought under at that time ,
&c.] Humbled and weakened, but not reduced to the government of the house of David:

and the children of Judah prevailed ;
or grew strong:

because they relied upon the Lord God of their fathers ;
trusted in him, and not in an arm of flesh; the Targum is, ``in the Word of the Lord God of their fathers.''