OTD 1940
German army murders almost all of the 440 patients of Chełm psychiatric hospital in occupied Poland. The few who remained were children patients, who ran to various hideouts - wardrobes, attic, basement, etc. It took roughly 2 days to find them all & complete the task. 

No one was ever prosecuted for this. The Federal Republic of Germany (established post-war) provided shelter, aid and protection to war criminals. They even got pensions. With extras for hardship of their wartime service for Germany...