If World War I was the chemists’ war, World War II was the physicists’ war. As with other total wars, it is difficult to draw a line between military funding and more spontaneous military-scientific collaboration during World War II. Well before the Invasion of Poland, nationalism was a powerful force in the German physics community (see Deutsche Physik); the military mobilization of physicists was all but irresistible after the rise of National Socialism. German and Allied investigations of the possibility of a nuclear bomb began in 1939 at the initiative of civilian scientists, but by 1942 the respective militaries were heavily involved. The German nuclear energy project had two independent teams, a civilian-controlled team under Werner Heisenberg and a military-controlled led by Kurt Diebner; the latter was more explicitly aimed at producing a bomb (as opposed to a power reactor) and received much more funding from the Nazis, though neither was ultimately successful.