31st August, 1961 : The wall which the Communist have built across Berlin, sealing of the western sectors, is being made taller and stronger every day and, while the Western Powers are outraged by this swift and brutal action, it is becoming increasingly obvious that there is nothing they can do about it. The wall, made of prefabricated concrete blocks, went up with great rapidity. Building materials stored in the war-ruined buildings close to the line were brought forward and work started immediately on the wall which now snakes across Berlin. It was greeted with anger on both sides. East German police used hoses, truncheons and tear-gas on crowds milling around the closed crossing points.
Willy Brandt, the Mayor of West Berlin, appealed to East Berliners not to revolt. In a broadcast he promised to them: ”You can not be held in slavery for ever.”