Happily, the German Command had not discovered the weakness of the junction between Foch’s and Langle’s forces; and the Saxons did not at first prove formidable. The 17th Corps was, therefore, able on September 6 to make a short advance west of Courdemanges, nearly to the railway. At the centre, the remaining battalions of the 12th Corps and Lefebvre’s Colonials were attacked violently in the morning. Huiron and Courdemanges, at the foot of the hills, were lost, but retaken during the evening. The three delta hamlets of Frignicourt, Vauclerc, and Ecriennes were also lost, the last two to IV Army regulars who had crossed the St. Dizier road and canal. On the right, the enemy forced the Marne-Rhine canal west of Le Buisson; and for a moment there was a danger of the Colonials being cut off from the 2nd Corps. To fill the breach, General Gerard transferred a brigade of the 4th Division from Pargny to near Favresse. Perhaps because of the consequent weakness of the right of the 2nd Corps, it could not hold the line of the canal from Le Buisson to Etrepy; and Von Tchenk’s XVIII Corps entered Alliancelles, 5 miles west of Revigny, and crossed the Ornain, in the afternoon. Reinforced by his Reserve, Tchenk pushed his advance on the following day, September 7, seizing Etrepy village, where the Saulx and Ornain join across the Rhine canal, at dawn, and Sermaize a few hours later. Langle was here faced with a grave danger. His centre was still holding pretty well: Huiron was again lost, but the Colonials had recovered Ecriennes. On his left, the 17th Corps slightly improved its position, albeit the hazardous thinness of this part of the French front could not be much longer concealed. It was for his wings, therefore, that he was most anxious; and thither the two promised corps of reinforcements, the 15th and 21st, were directed. The 15th reached the right, to prolong Sarrail’s line, just in time. The enemy had, at a heavy cost, passed the Saulx-Ornain valley, with its many lesser water-courses, and had reached the edge of the wooded plateau of Trois-Fontaines, beyond which, ten miles south of Sermaize, lay the important town of St. Dizier. To break through thus far would be to cut off Sarrail at Bar-le-Duc from Langle at Vitry-le-François; it would be the doom of Verdun, and probably of the French centre. The greatness of the stake, the bitterness of the disappointment, afford the only explanation of the abnormal savagery shown by the Crown Prince’s troops in this region.