John Wesley on Isaiah 18:1

The lord - Either Ethiopia beyond Egypt; or of Egypt. Wings - The title of wings is given, in scripture, to divers things which have some kind of resemblance to wings, as to the battlements of an house or temple, to an army, and to the sails of a ship, as this word is here commonly understood. And shadowing with wings is nothing else but overspread or filled with them. Which title may be given either to Ethiopia or Egypt, in regard of the great numbers either of their armies, or of their ships or vessels sailing upon the sea or rivers. Besides - Situated on both sides of the Nile. Rivers - Called rivers, in the plural number, either for its greatness, or for the many rivulets that run into it, or for the various streams into which it is divided.