The manner in which the battle originated rendered unity of direction impossible.
It was but the advanced-guards of four Divisions which were the troops principally engaged; and the daring attacks made on greatly superior hostile forces by small bodies unfollowed by immediate supports occasioned many critical moments, which might have been dangerous if the enemy had pushed forward more energetically in closely concentrated strength. But while, for instance, his IIIrd Corps received no support from the Imperial Guard standing close behind it, the contrast presented itself that on the Prussian side, in this as in the previous battles, there shone forth, along with their ready acceptance of personal responsibility, the eager mutual helpfulness of all the commanders within reach of the battle-field.
An essential share of the success of the day must be attributed to the artillery. Hurrying along in front, leaving the responsibility of covering it to the advanced guards which reached forward before the main bodies of the Divisions had time to come up, it drove the French completely out of their positions before Metz, and back under the guns of the defences of the place.
The protection so afforded to the enemy rendered it impossible that the victory of Colombey-Nouilly should yield any trophies, but the supreme Command was quite content with the results obtained. The retreat of the enemy had been arrested, and a day had been gained for the crossing of the Moselle by the IInd and IIIrd Armies.
August 15th.—In the early morning of the 15th the cavalry had ridden forward to the outworks of Metz, but found none of the enemy on this side of the fortress. A few shells scared away the Imperial Head-quarter from Longeville on the further side of the Moselle.
As King William was riding over to visit the Ist Army, immense clouds of dust were observed rising on the further side of the fortress; and it was no longer doubtful that the French had begun their retreat, and that the IInd Army was henceforth free to follow across the Moselle with all its Corps.
The Ist Corps of the Ist Army was necessarily left at Courcelles, south of Metz, to protect the railway, the other two were brought up leftward towards the Seille; and they were also by-and-by to cross the Moselle higher up, so as to avoid interference from the fortress.
The French had started again on the retreat interrupted on the previous day, but proceeded little more than four miles[8] beyond Metz on August 15th. Their cavalry only went somewhat farther ahead, by both the roads to Verdun.
The IIIrd Corps of the German IInd Army crossed the Moselle at Novéant, by the bridge which was found intact, and by a flying pontoon bridge; its artillery, however, was forced to make a détour by Pont à Mousson.
It was not until late at night that the troops were all across and in bivouac close to the left bank. One Division of the Xth Corps remained at Pont à Mousson and the other advanced to Thiaucourt. The cavalry scouted farther forward towards the Metz-Verdun road, and struck in on the French cavalry near Mars la Tour. Several small engagements took place, but when early in the afternoon twenty-four Prussian squadrons had assembled, the French retired on Vionville. The Guard Corps and the IVth Corps crossed at Dieulouard and Marbache, higher up the river.