French concentration, the probable strength of the French, or Napoleon's intended offensive movements. Because of this the two Coalition commanders refrained from altering their dispositions, and waited for better intelligence. Blücher orders the concentration of his army Zieten's troops were kept under arms during the night, and were collected by battalions at their respective points of assembly. Later in the day Zieten's outposts reported that strong French columns, composed of all arms, were assembling in his front. This suggested an attack on the following morning, and this intelligence reached Blücher between 21:00 and 22:00 on 14 June. Orders were despatched by 23:00 for the march of the II Corps (Pirch I's) from Namur upon Sombreffe (a village on the Nivelles-Namur road close to Ligny), and of the III Corps (Thielemann's) from Ciney to Namur. Earlier that day an order had been forwarded to Bülow at Liège, ordering him to prepare his corps to Hannut in one march, and at midnight he was ordered to concentrate his troops in cantonment about Hannut. Zieten was directed to await the advance of the French in his position upon the river Sambre. In the event of him being forced to retire, he was to retreat as slowly as possible in the direction of Fleurus, to allow time for the concentration of the other three Prussian corps. Coalition uncertainty as to Napoleon's main line of attack The vigilance which was thus exercised along both the Anglo-allied and Prussian line of outposts, obtained for Wellington and Blücher the fullest extent of information which they could reasonably have calculated on receiving respecting the dispositions of Napoleon immediately prior to an attack. Blücher and Wellington were aware that considerable masses of French troops had moved by their right, and assembled in front of Charleroi. While they were aware that French troops beyond Tournai, Mons, and Binche had moved, this could have been intended to draw the Anglo-allied army towards Charleroi. If so the French would launch a feigned attack on it, while the real attack would be by Mons. Wellington made no changes to the disposition of his forces, but Blücher immediately ordered his army to concentrate at Sombreffe (a village on the Nivelles-Namur road at the junction of a road that ran to Charleroi). They would then be able to advance through Charleroi should that be the real line of attack, but also be astride a road