Town on the river Meuse, in Ardennes departement, NE France; population (1982) 24,535. Industries include textiles and dyestuffs; the town's prosperity dates from the 16th-17th centuries, when it was a Huguenot centre. In 1870 Sedan was the scene of Napoleon III's surrender to Germany during the Franco-Prussian War. It was the focal point of the German advance into France 1940.