‘And Yahweh said, “Just as my servant Isaiah has walked naked and barefoot for three years, for a sign and a wonder on Egypt and on Cush, so will the king of Assyria lead away the captives of Egypt, and the exiles of Cush, young and old, naked and barefoot, and with buttocks uncovered to the shame (‘nakedness') of Egypt.”
Then at the end of the three years of this continual and remarkable sign came the startling explanation. It was Egypt and not Ashdod at whom the sign pointed. Isaiah's action was to be a sign of what was eventually going to happen to Egypt and Cush. They would be totally defeated and humiliated. This demonstrated that Egypt could never be trusted to act as deliverer because she too would eventually need a deliverer. For both Egyptians and Cushites would be taken into captivity, and walk naked and barefoot, with their buttocks uncovered, a particular shame to the sophisticated Egyptians. They would be humiliated and shamed.
This sign and wonder would find fulfilment, firstly after the Battle of Eltekeh (in Palestine) in around 701 BC when Egyptian and Cushite captives would be taken and treated in this way, and then nearly fifty years later when Egypt was invaded, first by Esarhaddon who captured Memphis in the north and established Assyrian rule in the areas around, and then by Ashurbanipal who sacked Thebes in the south. The Cushite dynasty was defeated, and captives young and old would be led away never to return again.