All the troops that could be spared from the investing force were also withdrawn from before Belfort. Still there remained the important consideration that the available forces might not suffice to entirely cover the whole of the Lisaine line. The right wing was the locally weakest portion of the whole position, but here there was the least to be apprehended, the enemy's main attack, since the many needs of the numerous but inadequately equipped French army made the nearest possible vicinity of one of the railroads a necessity. The Vesoul line by way of Lure was broken in many places, and the Besancon line led towards the strong left wing. The country north of Chagey might therefore more weakly be held, and a reserve was formed of the largest part of the Baden Division, which was distributed in rear of the centre and left about Mandrevillars, Brevilliers and Charmont. The respite accorded by the enemy was turned to account with the utmost zeal in the construction of rifle-pits and of battery emplacements, the establishment of telegraph and relay lines, the improvement of roads and the replenishment of supplies and ammunition. _January 13th._--On the morning of the 13th the advanced posts of the 3rd Reserve Division were now attacked at Arcey, Ste. Marie and Gonvillars. They were instructed to withdraw before a superior force, but to hold their own long enough to compel the deployment of the hostile columns. The combat with French artillery coming up at wide intervals was therefore prolonged for a considerable time; then, after a three hours' resistance, a new position was taken up behind the Rupt brook, and the retirement on Tavey delayed until four in the afternoon. The advanced guard of General von der Goltz, after a whole brigade had deployed against it, also took up a position at Chavanni on a parallel front with that at Couthenans. Before the Allaine front the French did not succeed in driving General von Debschitz's advanced posts out of Dasle and Croix. _January 14th._--On the 14th General von Willisen with fifty dismounted Dragoons drove back the enemy advancing on Lure, and then retired with his detachment on Ronchamp.