These orders instructed that on the 31st two Corps of the Army of the Meuse should cross over to the right bank of the river, to prevent the possibility of further progress of the French to Metz by way of Montmédy. Two Corps of the army besieging Metz were besides already posted in that direction about Etain and Briey. The IIIrd Army was to continue its movement in the northward direction.
As the situation had now developed itself, it already seemed within sight that the Army of Châlons might be compelled to cross over into neutral territory, and the Belgian Government was therefore asked through diplomatic channels to concern itself with its disarmament in that event. The German troops had orders at once to cross the Belgian frontier, should the enemy not lay down his arms there.
While the Vth French Corps was still fighting about Beaumont, and when the rest of the army had crossed the Meuse, General MacMahon had ordered the concentration of his army on Sedan. He did not intend to offer battle there, but it was indispensable to give his troops a short rest, and provide them with food and ammunition. He then meant to continue the retreat by way of Mézières, which General Vinoy was just then approaching with the newly-formed XIIIth Corps. The Ist Corps, which had arrived at Carignan early in the afternoon, detached two of its divisions to Douzy in the evening to check any further advance of the Germans.
Though any pursuit immediately after the battle of Beaumont was prevented by the intervening river, the retreat of the French soon assumed the ominous character of a rout. The troops were utterly worn out by their exertions by day and night, in continuous rain and with but scanty supplies of food. The marching to and fro, to no visible purpose, had undermined their confidence in their leaders, and a series of luckless fights had shaken their self-reliance. Thousands of fugitives, crying for bread, crowded round the waggons as they struggled forward to reach the little fortress which had so unexpectedly become the central rallying point of a great army.
The Emperor Napoleon arrived at Sedan from Carignan late in the evening of the 30th; the VIIth Corps reached Floing during the night, but the XIIth Corps did not arrive at Bazeilles until the following morning. The Vth Corps mustered at the eastern suburb of Sedan in a fearfully shattered state, followed in the afternoon of the 31st by the Ist, which, after many rear-guard actions with the German cavalry, took up a position behind the Givonne valley. To pursue the march to Mézières on that day was not to be thought of. The XIIth Corps had that same evening to show a front at Bazeilles, where the thunder of their cannon already heralded the arrival of the Germans. The destruction of the bridges there and at Donchery was ordered, but the order remained unexecuted, owing to the worn-out condition of the men.