The Scofield Bible Commentary, by Cyrus Ingerson Scofield, [1917], at sacred-texts.com
Isaiah Chapter 10
that when
A permanent method in the divine government of the earth. Israel is always the centre of the divine counsels earthward (Deu 32:8). The Gentile nations are permitted to afflict Israel in chastisement for her national sins, but invariably and inevitably retribution falls upon them. See; (Gen 15:13); (Gen 15:14); (Deu 30:5-7); (Isa 14:1); (Isa 14:2); (Joe 3:1-8); (Mic 5:7-9); (Mat 25:31-40).
that day
"That day": often the equivalent of "the day of the Lord" (Isa 2:10-22); (Rev 19:11-21). The prophecy here passes from the general to the particular, from historic and fulfilled judgments upon Assyria to the final destruction of all Gentile world-power at the return of the Lord in glory. (See "Armageddon,"; (Rev 16:14); (Rev 19:21) "Times of the Gentiles,"; (Luk 21:24); (Rev 16:19); "The great tribulation,"; (Psa 2:5); (Rev 7:14); and
(See Scofield) - (Isa 13:19).