Operation Annie broadcasts

Operation Annie (also known as "1212", the frequency on which it broadcasts) was a covert Allied "black propaganda" radio station which began broadcasting in late 1944 from a secret location in Luxembourg and purported to be pro-German, playing patriotic traditional German songs. Over a period of 127 broadcasts, the station built up a loyal following of both German civilians and soldiers. By early 1945, the Allied forces were advancing on Germany and, under instruction from General Dwight Eisenhower, the radio station began broadcasting false information about Allied positions and implied a major assault into Germany was under way. This had the intended effect of making German civilians flee from their homes, which in turn hampered the retreat of the German army. Source: http://the.hitchcock.zone/wiki/Operation_Annie_(1946)