Werder defeated the French at Dijon and at Nuits and proceeded to besiege Belfort. General Charles Denis Bourbaki assembled an army intending to relieve Belfort, leading to the Battle of Villersexel. On 15 January 1871, Bourbaki attacked Werder along the Lisaine River; however, after a three-day battle, he was repelled and his army retreated into Switzerland.