It was indeed a massacre. But a small one compared to all of the slaughter made to Soviet prissoners. Also, German soldiers were shot by British and Americans some times. ALL did it at least once, of course, in different scales.

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"War is less costly than servitude, the choice is always between Verdun and Dachau." - Jean Dutourd, French veteran of both world wars

"A mon fils: depuis que tes yeux sont fermes les miens n’ont cessé de pleurir." - Mère française, Verdun