A second effort began under the administrative purview of the "Wehrmacht's " "Heereswaffenamt" on 1 September 1939, the day of the invasion of Poland. The program eventually expanded into three main efforts: the "Uranmaschine" (nuclear reactor), uranium and heavy water production, and uranium isotope separation. Eventually it was assessed that nuclear fission would not contribute significantly to ending the war, and in January 1942, the "Heereswaffenamt" turned the program over to the Reich Research Council ("Reichsforschungsrat") while continuing to fund the program. The program was split up among nine major institutes where the directors dominated the research and set their own objectives. Subsequently, the number of scientists working on applied nuclear fission began to diminish, with many applying their talents to more pressing war-time demands.