There was also another great eagle with great wings and many feathers: and, behold, this vine did bend her roots toward him, and shot forth her branches toward him, that he might water it by the furrows of her plantation. Another great eagle - Pharaoh-hophra, or Apries, king of Egypt.
With great wings - Extensive dominion.
And many feathers - Numerous subjects.
Did bend her roots - Looked to him for support in her intended rebellion against Nebuchadnezzar.