 Roughly, the Glan formed the boundary between the Departments of Sarre and Mont-Tonnerre (or Donnersberg in German).Offenbach and Hundheim, still many years away from their eventual merger, found themselves in two different departments.Offenbach, as a village lying mainly on the Glan’s left bank, now became the seat of a "mairie" ("mayoralty") within the Department of Sarre, the Arrondissement of Birkenfeld and the Canton of Grumbach.