I can't introduce Cathal Nolan's book Mercy: Humanity in War any better than he does himself, with these words:

This is not a book about war. It is about mercy and humanity… Mercy happens in a microsecond, wrapped inside a surprise moment of mortal danger; it restrains baser instinct and reminds us about higher things. This book shows that mercy limits cruelty in ways laws and honor codes seldom do, because mercy is the highest personal and moral quality any of us achieves. It is above all other virtues, even justice and courage. It is superior to bravery, especially in a soldier. It is the greatest gift we give to those we meet in civilian life who are suffering and for whom it is in our power to aid or harm. Greater still when offered to the defenseless in war.

Mercy is the grace that happens between those who have a fleeting superiority of physical power and those who cannot save or protect themselves. It is greater than a gift to the helpless and the innocent, for as Shakespeare wrote, it elevates the merciful, too.

Cathal J. Nolan is Director of the International History Institute at the Pardee School of Global Studies and Professor of History at Boston University. His most recent book was The Allure of Battle: A History of How Wars Have Been Won and Lost, which we discussed in Episode 79.