American Standard Version (ASV):
And Jehovah 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.
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.