This prophecy occupies this single chapter. Its design and scope it is not difficult to understand. The time when it was delivered is designated in Isaiah 20:1, and was manifestly in the reign of Hezekiah. The Assyrian empire had extended its conquests over Syria, Damascus, and Ephraim or Samaria 2-Kings 18:9-12. The king of Assyria lied sent Tartan to take possession of Ashdod, or Azotus, the maritime key of Palestine, and there was evident danger that the Assyrians would overthrow the government of Judah, and secure also the conquest of Egypt. In these circumstances of danger, the main reliance of Judah was on the aid which they hoped to derive from Egypt and Ethiopia Isaiah 20:5, as being alone able to repel the Assyrians. They relied rather on that aid than on God. To "recall" them from this, and to show them the vanity of such a dependence, and to lead them to rely on God, Isaiah was sent to them to be a sign; or to indicate by a symbolic action what would be the fate of the Egyptians on whom they were placing their reliance Isaiah 20:4. By showing the Jews what would be the destiny of Egypt, he designed to withdraw them from resting on their assistance, and to turn them to God for protection and aid.

The Prophet Isaiah a sign to Egypt and Cush or Ethiopia, that the captives and exiles of these countries shall be indignantly treated by the king of Assyria, Isaiah 20:1-6.
Tartan besieged Ashdod or Azotus, which probably belonged at this time to Hezekiah's dominions; see 2-Kings 18:8. The people expected to be relieved by the Cushites of Arabia and by the Egyptians. Isaiah was ordered to go uncovered, that is, without his upper garment, the rough mantle commonly worn by the prophets, (see Zac 13:4), probably three days to show that within three years the town should be taken, after the defeat of the Cushites and Egyptians by the king of Assyria, which event should make their case desperate, and induce them to surrender. Azotus was a strong place; it afterwards held out twenty-nine years against Psammitichus, king of Egypt, Herod. 2:157. Tartan was one of Sennacherib's generals, 2-Kings 18:17, and Tirhakah, king of the Cushites, was in alliance with the king of Egypt against Sennacherib. These circumstances make it probable that by Sargon is meant Sennacherib. It might be one of the seven names by which Jerome, on this place, says he was called. He is called Sacherdonus and Sacherdan in the book of Tobit. The taking of Azotus must have happened before Sennacherib's attempt on Jerusalem; when he boasted of his late conquests, Isaiah 37:25. And the warning of the prophet had a principal respect to the Jews also, who were too much inclined to depend upon the assistance of Egypt. As to the rest history and chronology affording us no light, it may be impossible to clear either this or any other hypothesis, which takes Sargon to be Shalmaneser or Asarhaddon, etc., from all difficulties. - L. Kimchi says, this happened in the fourteenth year of Hezekiah.

INTRODUCTION TO ISAIAH 20
This chapter contains a prophecy of the destruction of the Egyptians and Ethiopians by the Assyrians, which had been prophesied of separately in the two preceding chapters Isaiah 18:1, and now conjunctly in this: the time of it is given, Isaiah 20:1 the sign of it, the prophet's walking naked, and barefoot, Isaiah 20:2 the explanation and accommodation of the sign to the captivity of Egypt and Ethiopia, Isaiah 20:3 the use of this to the Jews, and the effect it had upon them; shame for their trust and dependence on the above nations, and despair of deliverance from the Assyrians by their means, Isaiah 20:5.

The invasion and conquest of Egypt and Ethiopia.