In 1916, Dillingen, which had been founded only in 1804, was joined with Friedrichsdorf. Dillingen took its name from a village which had been forsaken in the Thirty Years' War, on the rural area of which Friedrichsdorf's Huguenots later settled. Paul Tirard reported that the town archives were kept in French up until 1871, but thenceforth in German. He also states that the names on grave stones were French up and till 1914 and that Protestant Sunday services were held locally up until the same date.