After French Revolutionary troops marched in about 1794, the old territorial structures were swept away. Once the German lands on the Rhine’s left bank were annexed to France, new administrative entities arose based on the French Revolutionary model. They were set up in 1797, and were made permanent in 1801 (although actually, they did not last very long). Eschenau, just like Sankt Julian, belonged to the "Mairie" ("Mayoralty") of Offenbach, the Canton of Grumbach, the Arrondissement of Birkenfeld and the Department of Sarre. The states that were allied against France (Prussia, Austria and Russia), reconquered the German lands on the Rhine’s left bank in 1814. After a two-year transitional period, Eschenau passed to the Kingdom of Bavaria in a departure from what was generally considered the new border arrangements, with the Glan downstream from the mouth of the Steinalb generally being held to be the border between Bavaria and Prussia (or until 1834 the Saxe-Coburg and Gotha Principality of Lichtenberg). This exceptional arrangement, which also affected Sankt Julian and Obereisenbach, was part of an exchange against a village in the Oster valley. Sankt Julian at first became the seat of a "Bürgermeisterei" ("mayoralty") together with Eschenau and Obereisenbach. The merged municipality was called Sankt Julian-Obereisenbach. The mayoralty was united with the one in Ulmet in 1861, but became separate again in 1887. Late in the Second World War, in 1945, part of Eschenau was destroyed in an attack by American strafers. There were dead and wounded. In the course of the 1968 administrative restructuring in Rhineland-Palatinate, the mayoralty was dissolved and the villages of Sankt Julian-Obereisenbach, Eschenau and Gumbsweiler were amalgamated to form the greater municipality of Sankt Julian, which since 1972 has belonged to the "Verbandsgemeinde" of Lauterecken.