Isaiah 20:4

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.

So - within the space of three years.

Shall the king of Assyria lead away the Egyptians prisoners ... with (their) buttocks uncovered. Belzoni says that captives are found represented thus on Egyptian monuments (Isaiah 47:2; ; Nahum 3:8), where, as here, Egypt and Ethiopia are mentioned as in alliance. 'The monuments represent Sargon as warring with Egypt, and forcing the Pharaoh of the time to become tributary. They also represent Egypt at this time in that close connection with Ethiopia which the prophet implies' (G. Rawlinson).