 During the time of the French Revolution and the Napoleonic Era that followed, the German lands on the Rhine’s left bank were annexed by France.Langweiler belonged, during the French administration, to the "Mairie" (“Mayoralty”) of Grumbach, the Canton of Grumbach, the Arrondissement of Birkenfeld and the Department of Sarre.As early as 1793, French Revolutionary troops advanced up the Glan valley and took quarter in the villages near Grumbach, including Langweiler.