Operation Rose & The Barbed Wire Sunday (August 13, 1961)
Between 1949 and 1961, an estimated 2.7 to 3 million citizens escaped the German Democratic Republic (GDR) through the open sectors of Berlin — representing roughly one-sixth of East Germany's entire population and disproportionately composed of skilled doctors, engineers, and intellectuals ('the brain drain'). In the early morning darkness of Sunday, August 13, 1961, the East German army (NVA), police (Volkspolizei), and combat groups sealed off 193 streets, dug trenches, and tore up cobblestones to unroll barbed wire coils along 155 kilometers, severing transit links overnight.