Supernatural Friday-What Would Be the Ending for This Story?

Watching Terminator 3 (nothing else to do tonight) while I tried to think of a subject for Supernatural Friday to get put up Thursday as I'll be leaving for Ravencon tomorrow morning, it came to me. What would we humans do if suddenly another species that have been living among us suddenly decided it was time for them to inherit the Earth? This species may be shapeshifters, vampires, or even demons as our ancestors called them. Whatever they may be, what would we do? Our militaries would be called out, of course, but maybe these beings would destroy many of the soldiers and sailors. Then they would come after the humans. City by city, humans might be massacred and buildings end up empty and silent, except for the monsters. Armageddon would be the cry on our lips. What do you think those few surviving members of humanity do against these beings of supernatural strengths and magic? Tell me how this story might end in your comment..