What is the meaning of "Ki Lo Mu'af la'Asher Mutzak Lah"?
Sanhedrin 94b: When Sancheriv came against Yerushalayim, Yeshayah told him that the nation (Yehudah) that wearies itself in Torah will not fall to its oppressor.
Rashi: Melech Ashur, to whom was given to afflict your land, he does not tire from coming against them, until three times - once in the days of Pekach "va'Yikach Es Iyon v'Es Avel
What is the meaning of "ka'Es ha'Rishon Hekal Artzah Zevulun [v'Artzah Naftoli]"?
Rashi: This middle exile will be light, like the first one, in which only Zevulun and Naftoli were exiled. Also in the second, only the two and a half tribes in Ever ha'Yarden were exiled.
Radak: The first to exile, Tiglas Pil'eser, who exiled [Gad 1 ], Reuven, Chetzi Menasheh, Zevulun and Naftoli (refer to 8:23:1:2), was light (mild); refer to 8:23:3:3.
Radak citing Sanhedrin 94b: The fate of the first ones (the 10 Shevatim) who lightened (cast off) the yoke of Torah is not like the latter ones (Yehudah), who accepted a heavy yoke of Torah. They are worthy of miracles like those who passed through Yam Suf and walked across the (dried up) Yarden (when Bnei Yisrael entered Eretz Yisrael).
I do not know why Gad is omitted from all texts of Radak. (PF)
Why does it say "veha'Acharon Hichbid"?
Rashi #1: The last exile swept away everything, like one who is Mechaved (sweeps) the house.
Rashi #2: "Hichbid" is an expression of Kaved (heaviness); the verse called the first exiles Kal (light). Malbim - they were light, for they were not Kelalis (of the entire nation). The last was Kelalis.
Radak: The latter to exile, Sancheriv 1 , was harsh. He exiled the rest of the tribes.
Refer to 8:23:2:3.
This is unlike Sanhedrin 94a, which says that Tilgas Pilne'eser (the first to exile) is another name of Sancheriv. (PF)
Why does it say "Derech ha'Yam"?
Rashi: This refers to those who dwell by the sea of Tiverya, i.e. Eretz Naftoli - "Yam v'Darom Yerashah" (Devarim 33:23).
Radak: Because Sancheriv did not exile Yerushalayim, which is in the middle of Eretz Yisrael, it mentions the place on the borders of Eretz Yisrael - the sea and the Yarden. He did not conquer Yehudah until the days of Chizkiyah, and it was only temporary - once his camp was struck when he came against Yerushalayim, Yehudah returned.
What does "Ever ha'Yarden" refer to?
Rashi: It is the second exile, of Reuven and Gad [Malbim - and Chetzi Menasheh, who were in Ever ha'Yarden].
Radak: Refer to 8:23:4:2.
What is "Galil ha'Goyim"?
Rashi: It is all of Eretz Yisrael, which was Goleles ('rolled') to it all Goyim; all desired it and came there for business - "Nachalas Tzvi Tziv'os Goyim" (Yirmeyah 3:19).
Targum Yonasan: Great cities of Goyim.
Radak citing Sanhedrin 94b: Hashem said, if Sancheriv will renounce his intention to attack Yerushalayim, fine. If not, I will make him Galil of the nations. (Rashi 94b -Yegalgel (he will roll) in shame among all nations. Or, Galil is an expression of Galal (excrement).)
Malbim: The Gelilos (regions) of all the tribes [were subject to the last exile].