The brigade treated the wounded from 2 December Battle of Loigny–Poupry, after which they retreated back to Châteaudun ahead of the advancing Prussians. Following the loss of Vendôme and the harsh winter the morale of the detachment was low. They spent Christmas Day at Châteaudun before witnessing General Antoine Chanzy's defeat at the Battle of Le Mans on 12 January which effectively destroyed the army.