A slaughter so barbaric even some of the Nazi execution squad fainted. Newly unearthed pictures lay bare a notorious massacre in which 200 Greek prisoners were shot. Their story reveals a noble defiance no evil could extinguish..

The Germans seemed to delight in their own brutality, that summer morning in Athens. As the men were hustled down from the trucks and herded to the place of execution, a photographer was on hand to record each step of the path to death. Over the next four hours, in a valley on the edge of the…