Why can't God cope with Iron chariots?

> One of the core beliefs of Judaism and Christianity is that God is > omnipotent, able to do anything that is logically possible. But > surprisingly, the Bible does not consistently support this idea ... > there’s the following little-known Bible verse: *“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.”* — **Judges 1:19** Source I think the quotation is self-explanatory. How is this verse understood by Christian apologists?