I would get a nice AR-15 with a scope and a ghille suit and hide in the woods. If DayZ has taught me anything, its that crossbows are useless.Its a shame we don't still fight wars like that any-more.
I think Man some times needs to fight hand to hand combat, to fell alive.
Now we just mostly send missiles, drop bombs, use drones, we fight like cowherds.
The next world war could bring nukes, if that happens I be-leave most of us on the planet will die.
Who ever remains will be the strongest among us, and will be fighting hand to hand combat or using guns.
I would be using crossbows too, they give you stealth, guns mostly don't..