User blog comment:Duchland/The Two Great Wars in one?/@comment-257949-20100729180512

Antibiotics. They will be needed to reduce casualty rates. And, over time, progressively better armour of the trenches to stave of some of the effects of bombardment. Germany built its trenches from the start to be more solid and livable than those of the Allies; if Britain and France started to act like the Germans by concreting their trenches and generally improving their handiwork, then they could last even longer in a state of perpetual combat. Well, there would be psychological issues too, but I'm not much of an expert there.