Isaiah 18:6

6. They… be left The branches cut off for the fowls and beasts represent the carcasses of the enemy laid prostrate on the field, as the Assyrians were arrested in their march against Egypt. Both Judah is saved, and Egypt and Ethiopia are relieved from the dreaded foe. This is the message the Ethiopian ambassadors of Isaiah 18:2 were summoned to send off to their country. The message relates to the destruction of the enemy, and said destruction was a marked wonder, worthy to be known at the farthest places of the earth. For the enemy just ready to pounce upon the Egyptians, and with them upon Judah also, was itself pounced upon by the Almighty One. This event is the ensign on the mountains, and the trumpet sound (Isaiah 18:3) to which the prophet invites Ethiopia’s attention. The mustering of their hosts in self-defence is not now necessary. God has come to their defence, but chiefly in behalf of his people in Judah.