Charles Ellicott Commentary Deuteronomy 7:18

"thou shalt not be afraid of them: thou shalt well remember what Jehovah thy God did unto Pharaoh, and unto all Egypt;" — Deuteronomy 7:18 (ASV)

You shall not be afraid of them: but shall well remember ... Egypt. —No free nation could ever have the same ground for terror as a nation of slaves rising up against its masters. If Israel had been delivered by Jehovah in that position, it was a security for all time that He would give them the victory in every enterprise He called them to undertake.