A type prefiguring the shameful captivity of Egypt and Ethiopia, 1-6.
1 In the year that Tartan came to Ashdod (when Sargon the king of Assyria sent him) and fought against Ashdod and took it, 2 At the same time the LORD spoke by Isaiah the son of Amoz, saying, "Go, and remove the sackcloth from off your loins and take off your shoe from your foot." And he did so, walking naked and barefoot. 3 And the LORD said, "As my servant Isaiah has walked naked and barefoot three years for a sign and wonder upon Egypt and upon Cush, 4 So the king of Assyria shall lead away the Egyptians prisoners and the Cushites captives, young and old, naked and barefoot, even with their backsides uncovered, to the shame of Egypt. 5 And they shall be afraid and ashamed of Cush their expectation and of Egypt their glory. 6 And the inhabitant of this coastland shall say in that day, 'Behold, such is our expectation where we flee for help to be delivered from the king of Assyria. And how shall we escape?'"
Matthew Henry Commentary - Isaiah, Chapter 20[➚]