On June 6, 1944 the Anglo-American led alliance invaded Nazi occupied France. Known today as D-Day it would be the greatest invasion in history. And though the Red Army was by June of 1944 well into the process of bleeding the Wehrmacht white, inflicting approximately 80% of Germany's Second World War military casualties, this should not take away from the considerable achievement that is since remembered today and forever since as D-Day.
It was actually on June 5, 1944 that D-Day could really be said to have begun.
