Isaiah is instructed by God to walk naked and barefoot for three years as a sign to Egypt and Ethiopia. This signified that the king of Assyria, Sargon, would defeat and exile many people from Egypt and Ethiopia. Sargon sent his general Tartan to besiege and capture the Philistine city of Ashdod. Though Sargon is not mentioned elsewhere in the Bible or historical sources at this time, recent archaeological discoveries have revealed him as a great Assyrian king who conquered many lands, including parts of Egypt and Ethiopia. Isaiah's actions were meant to warn Judah not to ally with Egypt and Ethiopia in opposition to the Assyrian empire.