 In the 18th century, Unterjeckenbach experienced a pleasant upswing.During the time of the French Revolution and the Napoleonic Era that followed, the German lands on the Rhine’s left bank, and thereby Unterjeckenbach too, were annexed by France.Unterjeckenbach then belonged to the "Mairie" (“Mayoralty”) of Grumbach, while Grumbach itself was the seat of a canton, which in turn belonged to the Arrondissement of Birkenfeld in the Department of Sarre.