Rav Mordechai Eliyahu ZT"L on the Holocaust Being Gog Umagog
Translated from the Kol Tzofayich newsletter for Vayigash (very last paragraph):
Rav Eliyahu ZT"L used to say that the Holocaust was Gog Umagog, as it is written in the gemara that HKB"H could consider Hizkiya to be Mashiah and Sanheriv as Gog Umagog, but the sin caused this not to be so (Sanhedrin 94). If so, it's possible to consider the Holocaust as Gog Umagog. We have suffered enough.
The Rav related that someone had argued on his view and said that his words were not correct and that the War of Gog Umagog will be coming in the future, and he brought all types of proofs that it had not yet occurred. The Rav told him: "Whoever thinks that there needs to be a War of Gog Umagog will be in this war, while those who hold that it had occurred already will be exempt from it."
And in truth, there is a difference between a statement of someone as an explanation or as an idea and someone who is deciding Halacha. Rav Eliyahu is a Halachic decisor, and that which is decided here in this world is fulfilled in the next world. This is especially the case if we are dealing with words of Halachic decisors who say that everything is already prepared for Redemption.
- From the book Besha'ar Hamelech