Following the war, Sommer quickly returned to winning ways, and at the 1947 Turin Grand Prix in Valentino Park he won the first ever Grand Prix for Enzo Ferrari as an independent constructor.
Following the war, Sommer quickly returned to winning ways, claiming victory in the 1946 René Le Bègue Cup race at Saint-Cloud. At the 1947 Turin Grand Prix in Valentino Park he won the first ever Grand Prix for Enzo Ferrari as an independent constructor.