‘For thus says the Lord Yahweh, “The sword of the king of Babylon will come on you. By the swords of the mighty will I cause your mass of people to fall. They are all the terrible of the nations, and they will spoil the pride of Egypt, and all its mass of people will be destroyed. I will also destroy its beasts from beside many waters, nor will the foot of man trouble them any more, nor the hooves of beasts trouble them. Then I will make their waters clear, and cause their rivers to run like oil,” says the Lord Yahweh.'
The full significance of what has gone before is now brought home. All this will occur through the swords of the king of Babylon and his hosts. For they are Yahweh's sword. He holds them in His hand. And there will be massive destruction of both men and beast. Irrigation (carried out by foot of man and beast through their irrigation equipment) will cease. Nor will the waters be muddied by other activity of man and beast, for the population will be decimated. Thus the rivers and streams will run clear, and smoothly like oil.
While we do not know the details the invasion by Nebuchadnezzar would be resisted to the hilt. The Egyptians were fighting for their own land, and they had been a constant pain in his side. Neither would give up easily. We need not doubt that it would result in destruction on a large scale, similar to that in Judah but greater, as Egypt was itself far larger and more populated than Judah. And Egypt would have itself been suffering from civil war.
Note the repetition again of the words ‘says the Lord Yahweh'. The stress is on the fact that all comes about at His word.