King James Version (KJV)
And the LORD was with Judah; and he drave out {the inhabitants of} the mountain; but could not drive out the inhabitants of the valley, because they had chariots of iron. {drave...: or, possessed the mountain}
Modern English
Yahweh was with Judah; and drove out the inhabitants of the hill country; for he could not drive out the inhabitants of the valley, because they had chariots of iron.
Hebrew
וַיְהִ֤י יְהוָה֙ אֶתּ־יְהוּדָ֔ה וַיֹּ֖רֶשׁ אֶת־הָהָ֑ר כִּ֣י לֹ֤א לְהוֹרִישׁ֙ אֶת־יֹשְׁבֵ֣י הָעֵ֔מֶק כִּי־רֶ֥כֶב בַּרְזֶ֖ל לָהֶֽם׃
vayhiy yhvah ʾet-yhvdah vayoresh ʾet-hahar kiy loʾ lhvoriysh ʾet-yoshbey haʿemeq kiy-rekeb barzel lahem