They have blown the trumpet, even to make all ready; but none goeth to the battle: for my wrath is upon all the multitude thereof.

Then you shall set your face toward the siege of Jerusalem with your arm bared and prophesy against it.

On his right hand he is divining against Jerusalem, preparing to set up battering rams, preparing for the slaughter, getting ready to sound the alarm for battle, setting the battering rams in place at the gates, building siege mounds, and erecting a siege wall.