In December 1944, Adolf Hitler surprised the Allies with a secret counterattack through the Ardennes forest, known today as the Battle of the Bulge. In the carnage that followed, there was one incident that top military commanders hoped would be concealed. It’s the story of an American war crime nearly forgotten to history.

After desperate house-to-house fighting between German and American forces, American soldiers wrested control of the Belgian town of Chenogne. Americans rounded up the remaining German prisoners of war, took them to a field and machine-gunned them.

Reporter Chris Harland-Dunaway found an entry in General George S. Patton’s handwritten diary referring to the incident in Chenogne. Patton called it murder. So why then was there no official investigation?

Through vivid interviews with a 93-year-old veteran who witnessed the event, conversations with historians and the last surviving prosecutor from the Nuremberg Trials, and analysis of formerly confidential military records, we investigate why justice never came for the American soldiers responsible for the massacre at Chenogne.

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This post was originally published on Reveal.