Isa 17:12-18:7. Sudden Destruction of a Great Army in Judea (namely that of the Assyrian Sennacherib), AND Announcement of the Event to the Ethiopian Ambassadors.
The connection of this fragment with what precedes is: notwithstanding the calamities coming on Israel, the people of God shall not be utterly destroyed (Isa 6:12, 13); the Assyrian spoilers shall perish (Isa 17:13, 14).
12. Woe … multitude—rather, "Ho (Hark)! a noise of," &c. The prophet in vision perceives the vast and mixed Assyrian hosts (Hebrew, "many peoples," see on Isa 5:26): on the hills of Judah (so "mountains," Isa 17:13): but at the "rebuke" of God, they shall "flee as chaff."
to the rushing … that make—rather, "the roaring … roareth" (compare Isa 8:7; Jer 6:23).