The first reports brought in that morning were of the advance of a strong hostile column from Cravant on Fontaines and Le Bardon. This was Rébillard's Brigade, which, as it seemed, aimed at turning the Bavarian left flank and marching direct on Orleans. To oppose it on the bank of the Mauve, General von der Tann at about nine o'clock sent the 3rd Brigade in a southerly direction to Préfort, a little over two miles distant, and as at the same time a sharp contest had now begun at the outposts near Baccon, the 1st Brigade marched to La Renardière. The remainder of the Corps remained in and behind Coulmiers. The General's intention was to assume the offensive from this point against the enemy's left flank, if, as seemed probable, the latter should attempt to push his chief attack across the Mauve. In furtherance of this intention the cavalry of the right flank was ordered to close in to Coulmiers.
But the superior strength of the French allowed of their fetching a much wider compass to the left. While General d'Aurelle with the XVth Corps detained the Bavarians southward of the road from Ouzouer to Orleans, General Chanzy advanced with Barry's Division against their centre and directed Jauréguiberry's Division northward against their right; and finally the strong force of French cavalry under General Reyau moved in the direction of Patay, thus threatening the German communication with Paris.
This movement of the French XVIth Corps compelled General von Tann, at the very beginning of the engagement, to despatch the 2nd Brigade, which had constituted his reserve, to prolong his right wing northwards towards Champs, and thus obtain touch with the 4th Cavalry Brigade. The Bavarian Cuirassiers, retiring according to orders from St. Péravy to the southward, about eleven o'clock encountered Reyau's cavalry, which, however, restricted itself to a mere cannonade.
Meanwhile, after a stout resistance, the advanced posts of the Bavarians had been driven in by the enemy's superior strength. The 1st Rifle Battalion, after having retarded the advance of the French horse-batteries through Champdry for a long time, retreated from Baccon to La Rivière,[41] where it expected to be received by the 2nd (Rifle Battalion). But the situation of the latter soon became very critical. Peytavin's Division closely followed up through Baccon, beset La Rivière with five batteries, and then attacked the burning village from three sides at once. After energetic reprisals the Riflemen retired in good order on the 1st Brigade in Renardière, where General Dietl had taken up a position for defence.
After the evacuation of Baccon by the Bavarians, Barry's Division had continued its advance through Champdry, and its batteries deployed opposite Coulmiers and in front of Saintry, in preparation for an assault by strong lines of tirailleurs.
The 4th Bavarian Brigade occupied the park extending to the west; the quarries further in front were occupied by two battalions, two others were sent to the right to the farmsteads of Ormeteau and Vaurichard, so as to keep up some sort of communication with the 2nd Brigade. One battery to the south and four batteries to the north of Coulmiers were supported by the 5th Cavalry Brigade.
Thus at noon the Bavarian Corps, with only three brigades, held the ground from Renardière to the front of Gémigny, its front disproportionately extended to a length of more than four miles. But the French right wing remained quite inactive, so that the 3rd Brigade which had been sent to Préfort was recalled to Renardière.
When the French Corps had made good its foothold opposite the thin Bavarian line, it attacked in earnest at about one o'clock.
The Riflemen in Renardière had indeed repulsed the enemy's first rush, but this position was no longer tenable with only four battalions against the whole of Peytavin's Division. At about one o'clock General Dietl retired unmolested, under cover of an intermediate position, on the wood of Montpipeau, and occupied its border. Here he was joined by the 3rd Brigade, which on its retirement from Préfort had found Renardière already evacuated. The French had followed up from thence but hesitatingly, came under the fire of six batteries between the points of the forests at La Planche and Coulmiers, and made no further advance with their right wing.
In the centre Barry's Division about one o'clock had driven the Bavarian Riflemen out of the stone-quarries in front of Coulmiers. Not till three o'clock did it advance to a renewed general attack on the 4th Brigade, which was repulsed by the fire of the German guns and the repeated charges of the 5th Cavalry Brigade.