Later he worked on solid-propellant anti-aircraft rockets at the German WASAG military organization near Wittenberg. Around the end of World War II in Europe, the Oberth family moved to the town of Feucht, near the regional capital of Nuremberg, which became part of the American Zone of occupied Germany, and also the location of the high-level war-crimes trials of the surviving Nazi leaders. Oberth was allowed to leave Nuremberg to move to Switzerland in 1948, where he worked as an independent consultant and a writer.