I Corps effected its concentration in position between Ligny and Saint-Amand, at a distance varying from to in rear of its original extended line of outposts; after having successfully fulfilled the arduous task imposed upon it of gaining sufficient time for the concentration, on the following day, of all the Prussian Corps, by stemming, as well as its scattered force could do, the advance of the whole of the French Army of the North. Concentration of the Prussian Army By 15:00 of 15 June, the II Corps (Pirch I's) had taken up the position assigned to it between Onoz and Mazy in the immediate vicinity of Sombreffe, with the exception, however, of the 7th Brigade, which, having been stationed in the most remote of the quarters occupied by the II Corps, did not reach Namur until midnight. Here the latter found an order for its continuance in Namur until the arrival of the III Corps (Thielemann's); but as this had already taken place, the brigade, after a few hours' rest, resumed its march, and joined the II Corps at Sombreffe about 10:00 on 16 June. Thielemann passed the night at Namur, which he occupied with the 10th Brigade. The 9th Brigade bivouacked on the right, and the 11th on the left of Belgrade, at a village a short distance from Namur, on the road to Sombreffe. The 12th Brigade in rear of the 9th; the reserve cavalry at Flawinne, between that road and the Sambre, and the reserve artillery on the left of the road. Miscarriage of orders to Bülow It has already been mentioned above that on 14 June, Blücher sent off a despatch to Bülow, commander of the Prussian IV Corps, directing him to arrange for his Corps to be able to reach Hannut in one march; and that at midnight of 14 June, a second despatch was forwarded, requiring him to concentrate the IV Corps at Hannut. The first of these despatches reached Bülow, at Liège, at 05:00 15 June, and he issued orders that they should be acted on as soon as the troops had breakfasted. He forwarded a report of this arrangement to headquarters. These orders to his troops had been despatched for some hours, and the consequent movements were for the most part in operation, when around 12:00, the second despatch arrived altering the destination of the Corps. Bülow considered the effect the changes