Sforno on Deuteronomy 32:30/ספורנו על דברים ל״ב:ל׳

1איכה ירדוף אחד אלף, they should have realised that if they were able to pursue the Israelites, one against 1000, that this was not something natural.

2אם לא כי צורם מכרם, He fought against them, neutralising their aggressiveness and turning them weak like women.