Napoleon had reached Frasnes at nine o’clock on the morning of the 17th, and determined on attacking the allied commander. Still uncertain as to the route by which Blucher was retiring, he detached Grouchy in pursuit with the third and fourth corps, and the cavalry of Excelmans and Pajol, with directions to overtake the Prussian marshal, if possible, and in that case bring him to action.
While Buonaparte delayed his attack until his reserve and the sixth corps came up, his abler antagonist was preparing to retire. This operation in open day was difficult, as the Dyle was in the rear of the allies, and the long and narrow bridge at the village of Genappe the only means by which the corps d’armée could effect its passage. Wellington disposed some horse-artillery and dismounted dragoons upon the heights, and leaving a strong rearguard in front of Quatre Bras, he succeeded in making his retreat, until, when discovered, it was too late to offer any serious interruption to the regressive movement of the allies.
While the rear of the columns were still defiling through the narrow streets of Genappe, Napoleon’s advanced cavalry overtook and attacked the rearguard, and a sharp affair ensued. The 7th Hussars, assisted by some squadrons of the 11th and 23rd Light Dragoons, charged the French horsemen boldly, but they were repulsed; and a second effort was bravely but ineffectually attempted. The Life Guards were instantly ordered up, and led in person to the charge by Lord Anglesea, who was in command of the British rearguard. Their attack was decisive; the enemy were severely checked, and driven in great disorder back upon their supports. No other attempt was made by the French cavalry to embarrass the retreat of the allied columns, and except by an occasional cannonade, too distant to produce any serious effect, the remainder of the march on Waterloo was undisturbed by the French advance.
The allies reached the position early in the evening, and orders were issued for the divisions to halt and prepare their bivouacs. The ground for each brigade had been already marked out; the troops piled their arms, the cavalry picketed their horses, the guns were parked, fires were lighted along the lines, and all prepared the best mode of sheltering themselves from the inclemency of the weather, which scanty means could afford them in an exposed position like that of Waterloo.
All through the day rain had occasionally fallen, but as night came on the weather became more tempestuous. The wind rose, and torrents of rain, with peals of thunder and frequent lightning, rendered the dreary night before the battle anything but a season of repose.
While the troops bivouacked on the field, the Duke of Wellington with the general officers and their respective staffs occupied the village of Waterloo. On the doors of the several cottages the names of the principal officers were chalked—“and frail and perishing as was the record, it was found there long after many of those whom it designated had ceased to exist!”
The ground on which the allied commander had decided to accept battle was chosen with excellent judgment. In front of the position, the surface declined for nearly a quarter of a mile, and rose again for an equal distance, until it terminated in a ridge of easy access, along which the French had posted a number of their brigades, the intermediate space between the armies being covered by a rich crop of rye nearly ready for the sickle. In the rear, the forest of Soignies, intersected by the great roads from Charleroi to Brussels, extended; and nearly at the entrance to the wood, the little village of Waterloo was situated. The right of the British was stretched over to Merke Braine, and the left appuied upon a height above Ter le Haye. The whole line was formed on a gentle acclivity, the flanks partially defended by a small ravine with broken ground. The farmhouse of La Haye Sainte, in front of the left centre, was defended by a Hanoverian battalion, and the chateau of Hougomont, in advance of the right centre, held by a part of the Guards and a few companies of Nassau riflemen. This was the strongest point of the whole position; and the Duke had strengthened it considerably, by erecting barricades and perforating the walls with loopholes, to permit the musketry of its defenders to be effectively employed.
Wellington’s first line, comprising some of his best regiments, was drawn up behind these posts; the second was still further in the rear, and, from occupying a hollow, was sheltered from the fire of the French artillery. The third was formed of the cavalry; and they were more retired still, extending to Ter le Haye. The extreme right of the British obliqued to Merke Braine, and covered the road to Nivelles, while the left kept the communication with the Prussians open by the Ohain road, which runs through the passes of Saint Lambert. As it was not improbable that Napoleon might endeavour to reach Brussels by marching circuitously round the British right, a corps of observation, composed of the greater portion of the fourth division, under Sir Charles Colville, was detached to Halle; and consequently those troops, during the long and bloody contest of the 18th, were at a distance from the field, and remained non combattant.
The allied dispositions were completed soon after daylight, although it was nearly noon before the engagement seriously commenced. The division of Guards, under General Cooke, was posted on a rise immediately adjoining the chateau of Hougomont, its right leaning on the road to Nivelles; the division of Baron Alten had its left flank on the road of Charleroi, and was drawn up behind the house of La Haye Sainte. The Brunswick troops were partly in line with the Guards and partly held in reserve; and the Nassau troops were generally attached to Alten’s division. Some of the corps in line, and a battalion acting en tirailleur, occupied the wood of Hougomont. This corps d’armée was commanded by the Prince of Orange.
The British divisions of Clinton and Colville, two Hanoverian brigades, and a Dutch corps under the command of Lord Hill, were placed en potence, in front of the right.