Title: Cold War (1953–1962)
Content:  this context. On Saturday August 12, 1961, the leaders of East Germany attended a garden party at a government guesthouse in Döllnsee, in a wooded area to the north of East Berlin, and Walter Ulbricht signed the order to close the border and erect a Wall. At midnight the army, police, and units of the East German army began to close the border and by morning on Sunday August 13, 1961 the border to West Berlin had been shut. East German troops and workers had begun to tear up streets running alongside the barrier to make them impassable to most vehicles, and 
Title: Cold War (1953–1962)
Content:  German regime procured and stockpiled building materials for the erection of the Berlin Wall. Although this extensive activity was widely known, few outside the small circle of Soviet and East German planners believed that East Germany would be sealed off. On June 15, 1961, two months before the construction of the Berlin Wall started, First Secretary of the Socialist Unity Party and Staatsrat chairman Walter Ulbricht stated in an international press conference, ''"Niemand hat die Absicht, eine Mauer zu errichten!" (No one has the intention to erect a wall)''. It was the first time the colloquial term Mauer (wall) had been used 
Title: Berlin Wall
Content:   The Berlin Wall (Berliner Mauer, ) was a guarded concrete barrier that physically and ideologically divided Berlin from 1961 to 1989. Construction of the wall was commenced by the German Democratic Republic (GDR, East Germany) on 13 August 1961. The Wall cut off West Berlin from surrounding East Germany, including East Berlin. The barrier included guard towers placed along large concrete walls, accompanied by a wide area (later known as the "death strip") that contained anti-vehicle trenches, beds of nails and other defenses. The Eastern Bloc portrayed the Wall as protecting its population from fascist elements conspiring to prevent the "will of the people" from building a socialist state in East Germany. GDR authorities officially referred 
Title: Ida Siekmann
Content:  On 13 August 1961, East Germany began the construction of the Berlin Wall, and immediately after the border between East and West Berlin was closed numerous families and individuals from 50 Bernauer Straße addresses fled to the West. On 18 August 1961, East German leader Walter Ulbricht ordered the border troops to brick up the entrances and windows on the ground floor of the buildings on the southern side of the street. Members of the Combat Groups of the Working Class and Volkspolizei controlled every person who tried to enter the houses, and the residents were subject to rigid controls, even in the hallways. Many residents of such tenements still fled to West Berlin, as residents of the upper floors were 
Title: June 1961
Content: At 11:00 am, Walter Ulbricht, State Council Chairman of East Germany, opened a rare press conference in East Berlin for Western journalists, restating the Communist demand that Berlin should be a "Free City". Reporter Annamarie Doherr of the Frankfurter Rundschau asked Ulbricht whether a boundary would be erected at the Brandenburg Gate.  Ulbricht responded with the first reference to "die Mauer" (The Wall), "I understand by your question that there are men in West Germany who wish that we would mobilize the construction workers of the GDR in order to build a wall," and added, "No one has the intention 
Title: Emigration from the Eastern Bloc
Content:  remained guarded for some time after 9 November though at a decreasing intensity. On 13 June 1990, the official dismantling of the Wall by the East German military began in Bernauer Straße. On 1 July, the day East Germany adopted the West German currency, all border controls ceased, although the inter-German border had become meaningless for some time before that. That month, the final obstacle to German reunification was removed when West German Chancellor Helmut Kohl convinced Gorbachev to drop Soviet objections to a reunited Germany within NATO in return for substantial German economic aid to the Soviet Union.
Title: Separation barrier
Content:  and Hungary. After several weeks of civil unrest, the East German government announced on 9 November 1989 that all GDR citizens could visit West Germany and West Berlin. Crowds of East Germans crossed and climbed onto the wall, joined by West Germans on the other side in a celebratory atmosphere. Over the next few weeks, euphoric people and souvenir hunters chipped away parts of the wall; the governments later used industrial equipment to remove most of what was left. Contrary to popular belief the wall's actual demolition did not begin until the summer of 1990 and was not completed until 1992. The fall of the Berlin Wall paved the way for German reunification, which was formally concluded on 3 October 1990.
Title: Illegal emigration
Content:  On August 13, 1961, barbed-wire barrier that would become the Berlin Wall separating East and West Berlin was erected by East Germany. Two days later, police and army engineers began to construct a more permanent concrete wall. In East Germany, the term Republikflucht (fugitives from the Republic) was used for anyone wishing to leave to non-socialist countries. A propaganda booklet published by the Socialist Unity Party of Germany (SED) in 1955 for the use of party agitators outlined the seriousness of 'flight from the republic', stating "leaving the GDR is an act of political and moral backwardness and depravity", and "workers throughout Germany will demand punishment 
Title: Barbed Wire Sunday
Content:  Barbed Wire Sunday (Stacheldrahtsonntag), is the name given to 13 August 1961, when the military and police of East Germany closed the border between East and West Berlin and began the construction of what would become the Berlin Wall. The intention of closing the border was to prevent the migration of East Germans to the West. Prior to the establishment of the wall, approximately 3.5 million (or 20% of the population) East German citizens defected to West Germany, many through the Berlin border due to its lack of security. This posed a major issue to the government as it was losing its substantial amounts of not just its workforce but also its intellectuals.
Title: Nikita Khrushchev
Content:  Walter Ulbricht to begin construction of what became known as the Berlin Wall, which would surround West Berlin. Construction preparations were made in great secrecy, and the border was sealed off in the early hours of Sunday, 13 August 1961, when most East German workers who earned hard currency by working in West Berlin would be at their homes. The wall was a propaganda disaster, and marked the end of Khrushchev's attempts to conclude a peace treaty among the Four Powers and the two German states. That treaty would not be signed until September 1990, as an immediate prelude to German reunification.

Question: when did the wall go up in east germany?
Answer: ), starting on.