 During the years 1941–1948 Herold was first called up for military service during World War II and then ended up as a prisoner of war of the Soviet Union.After coming home in 1948, he resumed his duties in Weinsberg and stayed on this post until retirement at the end of 1964.Herold's main contributions to viticulture was a scientifically based grape breeding programme in Weinsberg, which produced several much-cultivated grape varieties.