Despite having suffered heavy losses in 1812 and 1813 fighting as an ally of France, Württemberg agreed to raise an army for the Allies of 12,250 regular infantry, 2,900 cavalry and 12,250 militia. By strenuous efforts this quota was filled. At first, the Württemberger contingent was designated the German VI Corps, but in a subsequent reorganization it became the IV Corps in the main Allied army of Austrian Field Marshal Karl Philipp, Prince of Schwarzenberg. It marched to war with 14,000 men and 24 artillery pieces. Frederick William directed his corps in the First Battle of Bar-sur-Aube on 24 January 1814. One source asserted that IV Corps suffered 900 casualties in this combat while their Austrian allies lost 837. French losses were about 1,200. The IV Corps participated in the Allied victory over Napoleon at the Battle of La Rothière on 1 February.