Today is a bad day for massacres. The movie Anthropoid is quite good if a bit friendly to the history on the first one. The second one in Oradour-sur-Glane is like something out of a Mel Gibson movie (The Patriot) but this actually happened.
1942: The Lidice Massacre
In a brutal act of retaliation for the assassination of top SS official Reinhard Heydrich, the Nazis destroyed the Czechoslovakian village of Lidice. All 173 men and boys over 16 were executed, while the women and children were deported to concentration camps. The tragedy is documented by the The History Place. [1, 2]
1944: The Oradour-sur-Glane Massacre
Four days after D-Day in France, soldiers from the Nazi SS Das Reich Division committed one of the worst single-day atrocities in Western Europe. They massacred 642 civilians—including 207 children and 245 women—in the French village of Oradour-sur-Glane. The village was never rebuilt and stands as a permanent memorial. You can read about the grim details on The History Place. [1, 2, 3]