In 1793, the Duchy was conquered by invading French troops, putting Charles II August to flight, shortly whereafter his palace was burnt down. By 1805, Dunzweiler, along with the rest of the German lands on the Rhine’s left bank, had been annexed to Napoleon’s empire, within which the "Commune de Dunzweiler" found itself until 1814 in the Canton of Waldmohr, the Arrondissement of Sarrebruck (Saarbrücken) and the Department of Sarre, whose seat was at Trèves (Trier). In 1805, the French administration had a "plan géometrique" of Dunzweiler laid out, that is, a map with building areas and divisions of farm fields drawn in. This makes it clear that there was a great upswing in the village’s population in the 19th century. While there had been only 50 houses in Dunzweiler in 1805, there were 96 in 1845.