The event took place on December 7, 1970, in what was then the Communist People’s Republic of Poland during a visit to a monument to the Nazi-era Warsaw Ghetto Uprising. After laying down a wreath, Brandt, very surprisingly, and to all appearances spontaneously, knelt. He remained silently in that position for a short time, surrounded by a large group of dignitaries and press photographers.
On the same day, Brandt signed the Treaty of Warsaw, which acknowledged the Oder-Neisse-Line as the final German border with Poland. Both actions attracted controversy within Germany, as did Ostpolitik in general, favored only by a narrow majority in public opinion. It was disputed within his own party, whose voters had included a significant proportion of expellees from the formerly German territories in Poland, most whom then went to the conservative parties.
According to a Der Spiegel survey of the time, 48% of all West Germans thought the “Kniefall” was excessive, 41% said it was appropriate and 11% had no opinion. The Kniefall was a symbolic action the opposition tried to use against Brandt, as in a Constructive Vote of No Confidence in April 1972, which Brandt won by only two votes. Brandt’s landslide win in the next elections in late 1972 was also due to the growing view among voters that Brandt’s Ostpolitik—symbolized by the Kniefall—and his reformist domestic policies were helping to boost Germany’s international reputation and should be supported.
A monument to Willy Brandt was unveiled on 6 December 2000, in Willy Brandt Square in Warsaw (near the Warsaw Ghetto Heroes Monument) on the eve of the 30th anniversary of his famous gesture.