Isaiah 20:3-4. “And the Lord said, Like as my servant Isaiah hath walked naked and barefoot three years for a sign and wonder upon Egypt and upon Ethiopia; So shall the king of Assyria lead away the Egyptians prisoners, and the Ethiopians captives, young and old, naked and barefoot, even with their buttocks uncovered, to the shame of Egypt.”
The Assyrians were not known for their kindness. They were harsh masters, using shame and belittlement to intimidate their captives. Isaiah was a walking, talking object lesson of what was to come when Assyria swept down and conquered the land.