Charles Ellicott Commentary Isaiah 10:33

"Behold, the Lord, Jehovah of hosts, will lop the boughs with terror: and the high of stature shall be hewn down, and the lofty shall be brought low." — Isaiah 10:33 (ASV)

Behold, ... the Lord of hosts ... —The sudden change of tone indicates another pressure of the “strong hand” of Jehovah (Isaiah 8:11), another burst of most intense inspiration. So far you shall go, the prophet says to Sargon, as he said afterwards to Sennacherib (Isaiah 37:28–32), and no further.

In the “boughs” that are to be lopped, and the “thickets of the forest” that are to be cut down, we have the same imagery as in Isaiah 10:17-19. The constant boasts of the Assyrian kings that they cut down the forests of the nations they conquered gave a special fitness to this emblem of the work of the Divine Nemesis. High as the cedars of Lebanon might rise in their majesty, the “Mighty One” of Israel (better, Glorious One; compare Isaiah 10:18, Isaiah 33:21; Psalms 93:4) would lay them low.