Sforno on Leviticus 26:7/ספורנו על ויקרא כ״ו:ז׳

1ורדפתם את אויביכם, beyond the boundaries of your country.

2ונפלו לפניכם לחרב, without your even having to fight them. This is what Isaiah 66,16 referred to: “for with fire will the Lord contend; with His sword against all flesh, and many shall be slain by the Lord.”