At the Battle of Bar-sur-Aube on 27 February, Schwarzenberg attacked Oudinot by surprise, inflicting 3,060 casualties on the French while sustaining 2,400 casualties. Once the battle began, Kellermann crossed to the east bank of the Aube River. Jacquinot's division charged the Russian Lubny Hussars, mauling the regiment and driving off the Pskov Cuirassiers. Ismert's dragoon brigade charged a large Russian artillery battery three times. This foolhardy attack was repulsed and the 4th and 16th Dragoons suffered 400 killed and wounded between them. Nevertheless, Schwarzenberg was alarmed at the persistence of the French attacks and proceeded with caution. During the withdrawal, there was a brief panic when the infantry rearguard fled through the ranks of Kellermann's cavalry, but order was soon restored. After their defeat, the French withdrew to the west.