In this he reckoned the Prussians at 40,000 men, and ordered Grouchy to repair with the French right wing to Sombref.
" … I shall be at Fleurus between 10 and 11 a.m.: I shall proceed to Sombref, leaving my Guard, both infantry and cavalry, at Fleurus: I would not take it to Sombref, unless it should be necessary. If the enemy is at Sombref, I mean to attack him: I mean to attack him even at Gembloux, and to gain this position also, my aim being, after having known about these two positions, to set out to-night, and to operate with my left wing, under the command of Marshal Ney, against the English."
The Emperor did not reach Fleurus until close on 11 a.m., and was undoubtedly taken aback to find Grouchy still there, held in check by the enemy strongly posted around Ligny. Grouchy has been blamed for not having already attacked them; but surely his orders bound him to wait for the Emperor before giving battle: besides, the corps of Gérard, which had been assigned to him was still far away in the rear towards Châtelet.[484] The absence of Gérard, and the uncertainty as to the enemy's aims, annoyed the Emperor. He mounted the windmill situated on the outskirts of Fleurus to survey the enemy's position.
It was a fair scene that lay before him. Straight in front ran the high-road which joined the Namur-Nivelles chaussée, some six miles away to the north-east. On either side stretched cornfields, whose richness bore witness alike to the toils and the warlike passions of mankind. Further ahead might be seen the dark lines of the enemy ranged along slopes that formed an irregular amphitheatre, dotted with the villages of Bry and Sombref. In the middle distance, from out a hollow that lay concealed, rose the steeples and a few of the higher roofs of Ligny. Further to the left and on higher ground lay St. Amand, with its outlying hamlets. All was bathed in the shimmering, sultry heat of midsummer, the harbinger, as it proved, of a violent thunderstorm. The Prussian position was really stronger than it seemed. Napoleon could not fully see either the osier beds that fringed the Ligny brook, or its steep banks, or the many strong buildings of Ligny itself. He saw the Prussians on the slope behind the village, and was at first puzzled by their exposed position. "The old fox keeps to earth," he was heard to mutter. And so he waited until matters should clear up, and Gérard's arrival should give him strength to compass Blücher's utter overthrow while in the act of stretching a feeler towards Wellington. From the time when the Emperor came on the scene to the first swell of the battle's roar, there was a space of more than four hours.
This delay was doubly precious to the allies. It gave Blücher time to bring up the corps of Pirch I. and Thielmann under cover of the high ground near Sombref, thereby raising his total force to about 87,000 men; and it enabled the two allied commanders to meet and hastily confer on the situation. Wellington had left Brussels that morning at 8 o'clock, and thanks to Ney's inaction, was able to reach the crest south of Quatre Bras a little after 10, long before the enemy showed any signs of life. There he penned a note to Blücher, asking for news from him before deciding on his operations for the day.[485] He then galloped over to the windmill of Bussy to meet Blücher.
It was an anxious meeting; the heads of the advancing French columns were already in sight; and the Duke saw with dismay the position of the Prussians on a slope that must expose them to the full force of Napoleon's cannon—or, as he whispered to Hardinge, "they will be damnably mauled if they fight here."[486] In more decorous terms, but to the same effect, he warned Gneisenau, and said nothing to encourage him to hold fast to his position. Neither did he lead him to expect aid from Quatre Bras. The utmost that Gneisenau could get from him was the promise, "Well! I will come provided I am not attacked myself." Did these words induce the Prussians to accept battle at Ligny? It is impossible to think so. Everything tends to show that Blücher had determined to fight there. The risk was great; for, as we learn from General Reiche, the position was seen to admit of no vigorous offensive blows against the French. But fortune smiled on the veteran Field-Marshal, and averted what might have been an irretrievable disaster.[487]
It would seem that the inequalities of the ground hid the strength of Pirch I. and Thielmann; for Napoleon still believed that he had ranged against him at Ligny only a single corps. At 2 p.m. Soult informed Ney that the enemy had united a corps between Sombref and Bry, and that in half an hour Grouchy would attack it. Ney was therefore to beat back the foes at Quatre-Bras, and then turn to envelop the Prussians. But if these were driven in first, the Emperor would move towards Ney to hasten his operations.[488] Not until the battle was about to begin does the Emperor seem to have realized that he was in presence of superior forces.[489] But after 2 p.m. their masses drew down over the slopes of Bry and Sombref, their foremost troops held the villages of Ligny and St. Amand, while their left crowned the ridge of Tongrines. Napoleon reformed his lines, which had hitherto been at right angles to the main road through Fleurus. Vandamme's corps moved off towards St. Amand; and Gérard, after ranging his corps parallel to that road, began to descend towards Ligny, Grouchy meanwhile marshalling the cavalry to protect their flank and rear. Behind all stood the imposing mass of the Imperial Guard on the rising ground near Fleurus.
The fiercest shock of battle fell upon the corps of Vandamme and Gérard. Three times were Gérard's men driven back by the volleys of the Prussians holding Ligny. But the French cannon open fire with terrific effect. Roofs crumble away, and buildings burst into flame. Once more the French rush to the onset, and a furious hand-to-hand scuffle ensues. Half stifled by heat, smoke, and dust, the rival nations fight on, until the defenders give way and fall back on the further part of the village behind the brook; but, when reinforced, they rally as fiercely as ever, and drive the French over its banks; lane, garden, and attic once more become the scene of struggles where no man thinks of giving or taking quarter.
Higher up the stream, at St. Amand, Vandamme's troops fared no better; for Blücher steadily fed that part of his array. In so doing, however, he weakened his reserves behind Ligny, thereby unwittingly favouring Napoleon's design of breaking the Prussian centre, and placing its wreckage and the whole of their right wing between two fires. The Emperor expected that, by 6 o'clock, Ney would have driven back the Anglo-Dutch forces, and would be ready to envelop the Prussian right. That was the purport of Soult's despatch of 3.15 p.m. to Ney: "This army [the Prussian] is lost, if you act with vigour. The fate of France is in your hands."
But at 5.30, when part of the Imperial Guard was about to strengthen Gérard for the decisive blow at the Prussian centre, Vandamme sent word that a hostile force of some twenty or thirty thousand men was marching towards Fleurus. This strange apparition not only unsteadied the French left: it greatly perplexed the Emperor. As he had ordered first Ney and then D'Erlon to march, not on Fleurus, but against the rear of the Prussian right wing, he seems to have concluded that this new force must be that of Wellington about to deal the like deadly blow against the French rear.[490] Accordingly he checked the advance of the Guard until the riddle could be solved. After the loss of nearly two hours it was solved by an aide-de-camp, who found that the force was D'Erlon's, and that it had retired.