Rewrited as Modern Military System

Guns, Tank, Fighter jets, and Aircraft carriers. What would happen if all of those things are used against Fantasy creatures? He is Lawrence Sharrington. He is one of the members of the royal family. He is stranded on an island in the middle of nowhere. He is the only person on that island. The only one that can help him is nobody except for himself. Things aren't exactly good for him, thanks to a hole in his foot. Blood rushed down from that hole like a stream of a river. He passed out, then something happened... "I remember everything." If there were an inaccuracy, I'm sorry because I don't have any military background.