Interesting thought.
I tend to think that is still literal . . . though I also think it is likely demonic forces/fallen angel forces or some such . . . though there is the highway thing.
It’s just that the logistics of 200 million strong force on land becomes more or less insurmountable apart from UFO transport etc.
I have wondered if the 200 million might be a description of the FIRE POWER of the army. But mostly, I don’t think so. I tend to apply literal interpretations wherever remotely possible.
LOL!