Hell Invades Heaven

You, an absolutely newbie hellish commander, gain the possibility to prove that all rumors about your person are at least 28% wrong, and you are in fact capable of commanding small forces in the greatest Hell vs Heaven war that ever happened. Put on your Unterleutnant uniform and do your job. Can you imagine that God himself missed paying hot water bill? Take command of hellish forces and with the small help of Almighty, but a little bit lazy Devil, show this old man, that hell kettles are not boiling for free.