John Gill Commentary Deuteronomy 7:23

"But Jehovah thy God will deliver them up before thee, and will discomfit them with a great discomfiture, until they be destroyed." — Deuteronomy 7:23 (ASV)

But the Lord your God shall deliver them to you

Gradually, by little and little, until at length they should all come into their hands: and shall destroy them with a mighty destruction until they be destroyed; even all of them.