After months of servicing as the enemy's stress reliever, and fed with nothing but their bliss. The POW is nothing more then just a mush of moans and a gagging meat doll. Hammered endlessly literally into no man's land. The only path for him is to either die from malnutrition, or for his captor's trench to be pushed back into a retreat. Which could give him a window to escape (or get him killed in the chaos of war.)