Isaiah 20:1

In the year that Tartan came unto Ashdod

The purpose of the chapter

Judah, alarmed by the capture of Samaria, and the rapid extension of the Assyrian invasion, looked for assistance from Egypt.

And the aim of this brief chapter is to recall king and people from any such reliance, by the announcement that the King of Assyria would shortly prevail against Egypt, and lead into captivity multitudes of prisoners. (F. B. Meyer, B. A.)

The date of the prophecy

The date of the prophecy is assured. The expedition mentioned took place in 711 B.C., and is minutely related in two of Sargon’s own inscriptions.
See Schrader, Cuneiform Inscriptions, vol. 2. (Cambridge Bible for Schools.)

The Tartan,

The Tartan, Assyrian, turtanu, i.e., Commander-in-chief. (A. B.Davidson, LL. D.)