The First World War killed around eight million men and bled Europe dry. In this provocative book Niall Ferguson asks: was the sacrifice worth it? Was it all really an inevitable cataclysm and were the Germans a genuine threat? Was the war, as is often asserted, greeted with popular enthusiasm? Why did men keep on fighting when conditions were so wretched? Was there in fact a death wish abroad, driving soldiers to their own destruction? The war, he argues, was a disaster - but not for the reasons we think. Far worse than a tragedy, it was the greatest error of modern history.