וַיִּכָּנְע֥וּ בְנֵי־יִשְׂרָאֵ֖ל בָּעֵ֣ת הַהִ֑יא וַיֶּֽאֶמְצוּ֙ בְּנֵ֣י יְהוּדָ֔ה כִּ֣י נִשְׁעֲנ֔וּ עַל־יְהוָ֖ה אֱלֹהֵ֥י אֲבוֹתֵיהֶֽם׃
Thus the children of Israel were brought under at that time, and the children of Judah prevailed, because they relied upon the LORD, the God of their fathers.
Read midrashic interpretation of II Chronicles 13:18: and classical rabbinic exegesis.