In consequence of the Head-quarter of the IInd Army having ordered the XIIth Corps, although it stood on the right,[11] to form the extreme left, a serious delay occurred from the crossing of the respective lines of march. The Saxon troops had not entirely passed through Mars-la-Tour until nine o'clock, and till then the Guard Corps could not follow.
Meanwhile the advanced guard of the XIIth Corps had already reached Jarny, and pursued its march as far as Briey without encountering the enemy.
Before information to this effect came in, the conviction had been reached in the Royal Head-quarter that at all events the main forces of the enemy still remained before Metz; there was, however, a difference of opinion as to the extension of the French front, which it was assumed did not reach beyond Montigny. The Head-quarter of the IInd Army was therefore instructed not to extend further northward, but to attack the enemy's right wing with the IXth Corps, and push in the direction of Batilly with the Guard and the XIIth Corps. The Ist Army was not to begin its frontal attack until the IInd should be ready to co-operate.
In obedience to those instructions Prince Frederick Charles ordered the IXth Corps to march towards Verneville, and, in case the French right wing should be found there, to begin the action by promptly bringing a large force of artillery into action. The Guard was to continue its advance by way of Doncourt to support the IXth as soon as possible. The XIIth was to remain at Jarny for the present.
A little later fresh reports came in, which indicated that the IXth Corps, should it proceed in the manner ordered, would not strike the enemy on his flank, but full on his front. The Prince, in the discretion of his high position, therefore determined that the Corps should postpone its attack till the Guard Corps should have been brought to bear upon Amanvillers. At the same time the XIIth Corps was to push on to Ste. Marie aux Chênes.
But while these orders were being expedited, there was heard from Verneville at twelve o'clock the roar of the first cannon shots.
The two Corps of the left wing had, moreover, of their own accord, taken an easterly direction, and the IIIrd Corps moved up in rear of the IXth to the Caulre farm.