The downfall of Babylon is foretold (vl-2) by the hands of Media and Elam (Elam a part of Persia). This comes quickly like a whirlwind. Judgment can
happen in an instant.
In seeing this there is a great impact on Isaiah (v3-4). Being faithful to the Lord means sharing graciously the message of judgment with others to warn them This is never easy, it will take a lot out of us, but we must be faithful.
The forthcoming attack is very graphically described as a watchman is called to look out for the coming invaders (v5-10). God’s people are always called to watch and pray! We’re always in a spiritual war and must be ready.
Dumah (v11-12) is believed to be a word for silence and a play on the name Edom (Seir is the capital of Edom). The watch men are to be ready there, indicating probably that this is the route the invaders would come in from.
The focus then goes to Arabia (v11-17) and the Dedanites, Tema and Kedar are either names of tribes or cities. They too would be greatly impacted by this invasion. Their caravans have to hide among the thickets and go off the main camel routes (vl3) and their mighty men will be few (vl6-17). Also, they
will receive others who have fled from the invading army (vl4-15).

The prophecy again highlights the knowledge and control God has over all.