In 1935, two years after the Nazi Party's "Machtergreifung", Tamm's liberal acting mayor "Karl Mammele" was forced to resign and committed suicide soon after. While Tamm was target of occasional air raids as soon as 1941, the village didn't see any "real" fighting until April 1945, when it was repeatedly shelled during a twelve-day stand-off between Wehrmacht and Free French Forces in nearby Bietigheim-Bissingen. Tamm was captured and occupied by the French Army on April 21, 1945. In July of the same year, the village was transferred to US control, eventually becoming part of the American occupation zone. The post-war years were marked by food and fuel shortages, but Tamm soon recovered and flourished once again, reaching 3900 inhabitants in 1961.