The armies will be the ones eliminated because they are there at the battle and they will be the feast for all the fowl of the air that have been called to gather together , yes the armies are in the winepress of God's wrath .The ruling with a rod of iron is described alongside descriptions of Christ smiting the people you think He will rule over and treading them in the winepress of God's wrath (Rev 19:15).
The people of the nations that are not at the battle are the ones who will be ruled with a rod of iron .
That is what the scriptures indicate to me at least . I will let you have the last word , we are divided on the meanings of the scripture .