If ever there was a war that takes place during Christ's millennial reign, the Lord God Almighty will need to shelter those who are in his millennial kingdom. He will need to say to them, that they should do only what the indwelling Holy Spirit Of God tells them to do. If he tells them that they should stay in place, and don't move, they should do exactly that.
If he tells them to run to a different location, they should ask him to tell them what to do, moment by moment, so that they can arrive safely. If he tells them to leave, but stop along the way, they need to know exactly when and where they should stop. Every facet of the trip should be planned with the indwelling Holy Spirit Of God. The Lord God Almighty is a God of deliverance.