After the Invasion of Poland on 1 September 1939 upon the staged Gleiwitz incident, the former RRG became a vital instrument of wartime propaganda, especially by the daily "Wehrmachtsbericht" and the popular request show "Wunschkonzert für die Wehrmacht" (see "Wunschkonzert"). From 9 July 1940 onwards all "Reichssender" aired the same uniform nationwide program, which ended with the occupation of the "Haus des Rundfunks" by the Red Army during the Battle of Berlin on 2 May 1945.