Paris was overtaken by the Nazis on June 14, 1940, and brutally occupied for more than four years. Thousands of Parisians died as a result. Martin Dugard, co-author with Bill O'Reilly of the bestselling "Killing" series and author of the new book "Taking Paris," talks about Paris during the time of the German occupation and the liberation of the city by the U.S. and French forces in August 1944.  Learn more about your ad choices. Visit megaphone.fm/adchoices