Necessity under which the French Emperor is placed of opening the Campaign without awaiting the further development of his resources 87 Slight retrospect of the Campaign of 1814 88 NAPOLEON's prospect of success 88 His preparations for the commencement of hostilities 90 WELLINGTON receives information from his Outposts in front of Tournai, of the assembling of French troops on the frontier; but delays the concentration of the Anglo-Allied troops until certain of the object and direction of NAPOLEON's main operation 91 Concentration of the French Army 91 NAPOLEON joins the latter in person 92 _Ordre du Jour_ of the 14th of June 93 CHAPTER IV. ZIETEN ascertains and communicates to the Allied Commanders the assembling of French troops in his front, and that there is every probability of an attack by the Enemy on the 14th or 15th of June 94 BLÜCHER's dispositions 96 Extent of information gained by WELLINGTON and BLÜCHER immediately previous to the commencement of hostilities 97 Position of the First Prussian _Corps d'Armée_ under ZIETEN 97 Advance of the French Army into Belgium on the 15th of June 98 The French force the Prussian Outposts; cross the Sambre, and gain possession of Charleroi 98 Retreat of the different Brigades of ZIETEN's Corps upon Fleurus 104 Affair at Gilly 106 ZIETEN's Corps concentrates in position between Ligny and St Arnaud 110 Losses experienced by this Corps on the 15th 111 The Second and Third Prussian _Corps d'Armée_, under PIRCH and THIELEMANN, concentrate and bivouac on the night of the 15th; the former between Onoz and Mazy not far from Sombref, the latter in and around Namur 111 BÜLOW is desired to concentrate the Fourth Prussian _Corps d'Armée_ at Hannut 112 Cause of this operation being deferred until the 16th 113 NEY joins the French Army, and receives from NAPOLEON the command of a detached Corps destined to operate by the Brussels road from Charleroi 114 The Advanced Post at Frasne, upon the extreme Left of the Duke of WELLINGTON's Army, receives intelligence of the French attack 115 Consequent movements of DE PERPONCHER's Dutch-Belgian Division 115