 One third of the aircraft in the wave bombed Trassenheide and killed at least 500 enslaved workers before the accurate markers on the housing estate drew the bombing onto the target.About 75 per cent of the buildings were destroyed but only about 170 of the 4,000 people attacked were killed, because the soft ground muffled bomb explosions and air raid shelters in the estate had been well built.Dr Walter Thiel, the chief engineer of rocket motors and Dr Erich Walther, chief engineer of the rocket factory, were killed.