The French had retired to La Ferté Bernard.
The 17th Division had at first followed in reserve. But at one o'clock, in consequence of the reports brought in, the Grand Duke detached it southward to Authon; and in order to follow the Head-quarter instructions as closely as possible he did at least push a detachment of two battalions, two cavalry regiments, and one battery towards Montmirail, under the command of General von Rauch.
_January 8th._--Finding on the morning of the 8th that the enemy was not advancing to the attack of St. Amand, General von Hartmann at nine o'clock sent back the troops which had crossed the river to his support. At ten o'clock also he received instructions to join the Xth Corps; but the French still continued to hold Villeporcher and the forest lying behind it, and were also drawn up across the Château Renault high road in a very advantageous position behind the Brenne. The General recognized the necessity of making a decisive stand here, and took the best means to that end by acting himself on the offensive. Supported by the fire of his battery, and accompanied by the cavalry on either flank, six companies of the 60th Regiment marched on Villeporcher, drove back its defenders in flight into the forest of Château Renault, and took 100 prisoners. On the left the 9th Uhlans drove the Chasseurs d'Afrique before them. Not till darkness had set in did General von Hartmann proceed in the direction of Montoire.
General von Voigts-Rhetz had already set out from thence very early in the day. The night's frost had covered the roads with ice, which cruelly impeded all movements of troops. The road on the right bank of the Loir was in many places broken up. It passed through a succession of narrow defiles, and on emerging from these the advanced guard found itself face to face with a force of about 1000 Gardes-Mobiles, who had taken up a position in front of La Chartre. Their mitrailleuses were soon forced to a hasty retreat by the fire of two field-guns, but it was only after a prolonged struggle that the infantry, moving with difficulty, succeeded at 4 o'clock in entering the town, where it took up quarters. Two battalions which were sent further on the road, had to fight for their night's shelter, and all through the night were exchanging shots with the enemy at close quarters, of whom 230 were taken prisoners.