What will God do to the Euphrates so the eastern army can cross?

God will sovereignly dry up the Euphrates River, making it dry as a bone, so the vast eastern army will not need bridges. They will simply migrate across the riverbed as they move westward toward the Middle East.

Les explains that at this point the Euphrates is still a great natural barrier. The bridges across it today could not handle moving a 200,000,000-man army. So in a future chapter, God will dry up the Euphrates, and it will be dry as a bone. Then the army will not need bridges at all; they will simply migrate across it as they move out of the east toward the Middle East.

What will God do to the Euphrates River so the 200 million man army can cross?

God will dry up the Euphrates River, leaving it dry as a bone. This removes the natural barrier, so the 200 million-man army will not need bridges but will simply migrate across it. The existing bridges across the Euphrates could not accommodate such a vast force.