 Political arrangements did not return to what they were before the Treaty of Versailles.Instead, the "Restkreis Baumholder" united in 1937 with the former Oldenburg territory around Birkenfeld and Idar-Oberstein, which had also remained with Germany, to form the new Prussian district of Birkenfeld.Through administrative reform in 1969, the so-called "Unterberggemeinden" (roughly “municipalities at the foot of the mountain”) in this district, namely Ruthweiler, Pfeffelbach, Reichweiler and Thallichtenberg with Lichtenberg Castle, were transferred from the Birkenfeld district to the Kusel district.