Killing from the sky has long offered the sort of detachment that warfare on the ground can’t match. Far from its victims, air power remains the height of modernity. And yet, as the monk Thomas Merton concluded in a poem , using the voice of a Nazi commandant, “Do not think yourself better because you burn up friends and enemies with long-range missiles without ever seeing what you have done.”

Nine decades have passed since aerial technology first began notably assisting warmakers. Midway through the 1930s, when Benito Mussolini sent Italy’s air force into action during the invasion of Ethiopia, hospitals were among its main targets. Soon afterward, in April 1937, the fascist militaries of Germany and Italy dropped bombs on a Spanish town with a name that quickly became a synonym for

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