Igino Giordani, when writing his memoirs, reflected on the terrible period of the First World War, in which he himself had to enlist, saying, “I saw the absurdity, the stupidity and above all the sin of war…”, as Benedict XV called it, the ‘useless massacre’. His words challenge us to think about how history could teach us to work for peace today, by opposing the new, absurd, useless massacres of our century.