A type prefiguring the shameful captivity of Egypt and Ethiopia.
Isaiah 20:1 In the year that Tartan came to Ashdod, when Sargon the king of Assyria sent him, (and he fought against Ashdod and took it,) Isaiah 20:2 at that time spoke Jehovah by Isaiah the son of Amoz, saying, Go and loose the sackcloth from off thy loins, and put off thy sandal from thy foot. And he did so, walking naked and barefoot. Isaiah 20:3 And Jehovah said, Like as my servant Isaiah hath walked naked and barefoot three years, a sign and a wonder concerning Egypt and concerning Ethiopia, Isaiah 20:4 so shall the king of Assyria lead away the captives of Egypt and the exiles of Ethiopia, young and old, naked and barefoot, and with buttocks uncovered, [to] the shame of Egypt. Isaiah 20:5 And they shall be terrified and ashamed of Ethiopia their confidence, and of Egypt their boast. Isaiah 20:6 And the inhabitants of this coast shall say in that day, Behold, such is our confidence, whither we fled for help to be delivered from the king of Assyria; and how shall we escape?