How far had the development of fusion research progressed in the German Reich by 1945? Dipl.-Ing. Rolf-Günter Hauk describes the German research into the development of a fusion weapon during the time of the Third Reich, whose influence ultimately culminated in the nuclear weapon detonated at the military training area in Ohrdruf. Through meticulous reconstruction, it is demonstrated that the bomb that was detonated was the world's first fusion-boosted nuclear fission bomb.