The anniversary could be a time of tension in Nazi Germany. The ceremony was cancelled in 1934, coming as it did after the so-called Night of the Long Knives. In 1938, it coincided with the "Kristallnacht", and in 1939 with the attempted assassination of Hitler by Johann Georg Elser. With the outbreak of war in 1939, security concerns caused the re-enactment of the march to be suspended, never to be resumed. However, Hitler continued to deliver his 8 November speech through 1943. In 1944, Hitler skipped the event and Heinrich Himmler spoke in his place. As the war went on, residents of Munich came increasingly to dread the approach of the anniversary, concerned that the presence of the top Nazi leaders in their city would act as a magnet for Allied bombers.