In the Thirty Years' War, Boppard lost one third of its population. Swedish troops under Rhinegrave Otto Ludwig occupied the town on 18 January 1632. In the Nine Years' War (1688–1697; known in Germany as the "Pfälzischer Erbfolgekrieg", or War of the Palatine Succession), an attack by French troops was successfully repulsed. In the War of the Polish Succession, French troops under General de Court attacked Boppard. The new Electoral City Policy of 1789 was meant to strengthen the Elector's influence, but by 1794, French Revolutionary troops had occupied the town, which remained under French rule for the next 20 years.