Eli5: How does military exercise or war game works?

Question

How can it prepare you for a battle or to defend from an enemy if you already know it’s coming and the fear of losing life is non existent?

In: 4

Answer 1

I’m not sure if I understand your question correctly.
Do you want to know why training (for anything) works?
That’s pretty easy. Simple example: Weapons.
Training how to use them means you can use them in a real battle/war.
That gives you a really good advantage compared to not being able to use a gun.