Battle of Ligny
PRINCE BLÜCHER having ascertained, on the morning of the 16th, that his communication with the Left Division of the Duke of Wellington's forces by Quatre Bras continued uninterrupted, resolved upon accepting battle in the position in rear of Fleurus, which had been previously fixed upon as the one most eligible, in the event of the Enemy's adoption of that line of operations respecting which all doubt and uncertainty had now ceased. Its importance in a strategical point of view, apart from tactical considerations, was manifest. Wellington having, on his part, selected Quatre Bras as the point whereon to concentrate his forces, the position in question, connected as it was with the latter by a paved road over an extent of not more than six or seven miles, offered great facility for co-operation and mutual support upon whichever point the great mass of the French Army might be directed.
Should it prove tenable, then, considered in conjunction with the advance of the Russians from the Rhine, the whole line of the Meuse below Namur, and the communications with Aix la Chapelle and the Prussian States, were effectually secured. If, on the other hand, either position should be forced by the Enemy, then Mont St Jean and Wavre, upon parallel lines of retreat towards Brussels and Louvain, would likewise offer the means of co-operation on the south side of the Forest of Soignies; and supposing Blücher willing to risk for a time his communication with the right bank of the Meuse, concentric lines of retreat upon Brussels would bring the two Armies in combined position in the immediate front of that capital.
Supposing also that Napoleon's plan had been to advance by Mons, the concentration of the Prussian forces could not have been effected upon a more favourable point than that of Sombref, whence they could have advanced in support of their Allies, leaving a sufficient portion of Zieten's Corps to watch the approaches by Charleroi: and, finally, had the French Emperor directed his main attack by Namur, the retreat of Thielemann's Corps would have secured time for effecting the concentration of the First, Second, and Third Prussian Corps d'Armée, if not also of the Fourth, while the Duke of Wellington's forces might have assembled at Quatre Bras, for the purpose of meeting any secondary attack from the Charleroi side, and of forming a junction with the Prussian Army.
The position itself comprises the Heights of Bry, Sombref, and Tongrines, contiguous to the high road connecting Namur with Nivelles, by Quatre Bras, and to the point of junction of that road with the one from Charleroi, by Fleurus. These Heights are bounded upon the south-west and western sides, or right of the position, by a ravine, through which winds a small rivulet along the Villages of Wagnelé, St Amand la Haye, and St Amand, near the lower end of which last, it unites with the greater rivulet of the Ligny; and, along the whole of the south side, or front of the position, by a valley, through which flows the Ligny, and in which lie, partly bordering the stream itself, and partly covering the declivities, the Villages of Ligny, Mont Potriaux, Tongrenelles, Boignée, Balatre, and Vilrets. At the last named point, another small rivulet falls into the Ligny on quitting a deep ravine, which commences northward of the Village of Botey, and thus tends to the security of the extreme Left of the position. The extreme Right, however, resting upon the Namur road, in the direction of Quatre Bras, was completely en l'air. The Heights in rear of St Amand, Ligny, and Sombref, are somewhat lower than those on the opposite or Fleurus side of the valley; and, from the nature of the ground, troops, particularly Artillery, are more exposed on the former than on the latter, where the undulations afford better cover. The descent from either side into the Villages of Wagnelé, St Amand la Haye, and St Amand, is gentle: between the latter point and Mont Potriaux the sides of the valley descend more rapidly: and below that Village they become steep, particularly about Tongrines, Boignée, and Balatre: while the ground above commands alternately from side to side. Above Mont Potriaux, the bed of the valley is soft, and occasionally swampy: below that point it partakes still more of this character. The buildings in the Villages are generally of stone, with thatched roofs, and comprise several farm houses with courtyards, presenting great capabilities for defence. St Amand and Boignée are the most salient points of the position, the central portion of which retires considerably, particularly near Mont Potriaux.
In the morning of the 16th, the First Corps (Zieten's) occupied that portion of the position which is circumscribed by the Villages of Bry, St Amand la Haye, St Amand, and Ligny. The four Brigades of this Corps had been very much mixed up together when occupying these Villages during the night, which will account in some measure for the promiscuous manner in which their several Battalions appear to have been distributed during the Battle. The main body of the Corps was drawn up on the Height between Bry and Ligny, and upon which stands the Farm and Windmill of Bussy, the highest point of the whole position. Seven Battalions of the Second Brigade (General Pirch II.) were formed immediately in rear of this Farm; the 28th Regiment and 2nd Westphalian Landwehr in the First, and the 2nd and 3rd Battalions of the 6th Regiment in the Second, Line; while the 3rd Battalion of the latter Regiment occupied the Farm itself, which was put into a state of defence. Two Battalions of the Fourth Brigade (General Count Henkel), namely, the 2nd Battalions of the 19th Regiment and of the 4th Westphalian Landwehr, stood on the slope between the Second Brigade and Ligny; while the remaining four Battalions of the Brigade—the 1st and 3rd of the 19th Regiment, and the 1st and 3rd of the 4th Westphalian Landwehr—were charged with the defence of Ligny. The Village of Bry was occupied by the 3rd Battalions of the 12th and 24th Regiments, belonging to the First Brigade (General Steinmetz); and the 2nd Battalion of the 1st Westphalian Landwehr was posted in rear of the Village in support. The 1st and 3rd Companies of the Silesian Rifles, attached to this Brigade, were distributed about the intersected ground between Bry and St Amand la Haye. The remainder of the First Brigade was posted on the Height in the rear of St Amand, its Right resting on St Amand la Haye; the 1st and 2nd Battalions of the 12th Regiment on the right, and the 1st and 2nd Battalions of the 24th Regiment on the left, forming a First, and the 1st and 3rd Battalions of the 1st Westphalian Landwehr forming a Second, Line. The defence of St Amand was confided to three Battalions of the Third Brigade (General Jagow)—the 1st and 2nd of the 29th Regiment, and the 2nd Battalion of the 3rd Westphalian Landwehr. The remaining six Battalions of this Brigade were posted in reserve northward of Ligny, and near the Bois du Loup. The 2nd and 4th Companies of the Silesian Rifles were thrown into Ligny. The Reserve Cavalry of Zieten's Corps continued in advance, upon the Fleurus high road, watching the movements of the Enemy.