World War II: The Nazis begin a <a href="https://en.wikipedia.org/wiki/Wola_massacre" id="mwAUA" rel="mw:WikiLink" title="Wola massacre">week-long massacre</a> of between 40,000 and 50,000 civilians and prisoners of war in <a href="https://en.wikipedia.org/wiki/Wola" id="mwAUE" rel="mw:WikiLink" title="Wola">Wola</a>, Poland.