Remarks upon the extraordinary degree of inactivity on the part of NAPOLEON 293 About noon, NAPOLEON proceeds to collect, in advance of Marbais, on the high road to Quatre Bras, a portion of the troops that had fought at Ligny; and detaches the remainder, under GROUCHY, in pursuit of the Prussians 296 NAPOLEON's instructions to Grouchy 297 The troops assembled near Marbais advance upon Quatre Bras, which they reach about two o'clock 298 The Corps of VANDAMME and GÉRARD do not reach Gembloux until late in the evening 299 GROUCHY's dispositions 300 Disposition of the Prussian troops during the 17th 302 Influence of the defeat at Ligny upon the _morale_ of the Prussian Army 305 BLÜCHER is informed of the position of the Anglo-Allied Army 306 His instructions to BÜLOW 306 On the 18th, VANDAMME's and GÉRARD's Corps commence the march from Gembloux, at nine o'clock, upon Wavre, preceded by the Heavy Cavalry under EXCELMANS, and supported on their left by MAURIN's Light Cavalry 307 At half past ten o'clock, EXCELMANS' Advanced Guard comes in contact with the Prussian Rear Guard 307 At Sart à Wallain GROUCHY's attention is called to the sound of a heavy cannonade in the direction of Mont St Jean 308 GÉRARD suggests to GROUCHY the expediency of marching towards the cannonade 308 GROUCHY's reasons for rejecting this proposal 309 The march upon Wavre continued 309 At daybreak on the 18th, BÜLOW quits his position near Dion le Mont to march through Wavre upon St Lambert, and thus commences the flank movement of the Prussians in support of the Anglo-Allied Army at Waterloo 310 BLÜCHER communicates to WELLINGTON his intention of immediately attacking the Enemy's Right Flank 311 Dispositions made for giving security to this movement 312 BLÜCHER directs that as soon as BÜLOW's Corps has proceeded beyond Wavre, ZIETEN's Corps is to commence its march by Fromont and Ohain to join the Left Wing of WELLINGTON's Army 312 PIRCH's Corps to follow BÜLOW's in the direction of St Lambert; and THIELEMANN's to follow ZIETEN's as soon as its presence at Wavre is no longer essential 312 The march of BÜLOW's Corps through Wavre delayed by an accident 313