The strategist of the gods (abandoned)

What will happen in the first chapters: A fan of strategy games turned into an officer of the army only to get killed by an explosion.

He gets "reincarnated" in a Valhalla at war in which his second try at life will get a hard trial where he must secede or die trying.

I'm new to writing so don't expect any all that great from me. And by the way i am neither a native speaker.