Ney still persisted in his isolated assaults; but reinforcements were now at hand that brought up Wellington's total to 31,000 men, while the French were less than 21,000. At nightfall the Marshal drew back to Frasnes; and there D'Erlon's errant corps at last appeared. Thanks to conflicting orders, it had oscillated between two battles and taken part in neither of them.
Such was the bloody fight of Quatre Bras. It cost Wellington 4,600 killed and wounded, mainly from the flower of the British infantry, three Highland regiments losing as many as 878 men. The French losses were somewhat lighter. Few conflicts better deserve the name of soldiers' battles. On neither side was the generalship brilliant. Twilight set in before an adequate force of British cavalry and artillery approached the field where their comrades on foot had for five hours held up in unequal contest against cannon, sabre, and lance. The victory was due to the strange power of the British soldier to save the situation when it seems past hope.
Still less did it redound to the glory of Ney. Once more he had merited the name of bravest of the brave. At the crisis of the fight, when the red squares in front defied his utmost efforts, he brandished his sword in helpless wrath, praying that the bullets that flew by might strike him down. The rage of battle had, in fact, partly obscured his reason. He was now a fighter, scarcely a commander; and to this cause we may attribute his neglect adequately to support Kellermann's charge. Had this been done, Quatre Bras might have ended like Marengo. Far more serious, however, was his action in countermanding the Emperor's orders' by recalling D'Erlon to Quatre Bras; for, as we have seen, it robbed his master of the decisive victory that he had the right to expect at Ligny. Yet this error must not be unduly magnified. It is true that Napoleon at 3.15 sent a despatch to Ney bidding him envelop Blücher's flank; but the order did not reach him until some time after 5, when the allies were pressing him hard, and when he had just heard of D'Erlon's deflection towards the Emperor's battle.[495] He must have seen that his master misjudged the situation at Quatre Bras; and in such circumstances a Marshal of France was not without excuse when he corrected an order which he saw to be based on a misunderstanding. Some part of the blame must surely attach to the slow-paced D'Erlon and to the Emperor himself, who first underrated the difficulties both at Ligny and Quatre Bras, and then changed his plans when Ney was in the midst of a furious fight.
Nevertheless, the general results obtained on June the 16th were enormously in favour of Napoleon. He had inflicted losses on the Prussians comparable with those of Jena-Auerstädt; and he retired to rest at Fleurus with the conviction that they must hastily fall back on their immediate bases of supply, Namur and Liège, leaving Wellington at his mercy. The rules of war and the dictates of humdrum prudence certainly prescribed this course for a beaten army, especially as Bülow's corps was known to be on the Liège road.
Scarcely had the Prussian retreat begun in the darkness, when officers pressed up to Gneisenau, on whom now devolved all responsibility, for instructions as to the line of march. At once he gave the order to push northwards to Tilly. General Reiche thereupon pointed out that this village was not marked upon the smaller maps with which colonels were provided; whereupon the command was given to march towards the town of Wavre, farther distant on the same road. An officer was posted at the junction of roads to prevent regiments straying towards Namur; but some had already gone too far on this side to be recalled—a fact which was to confuse the French pursuers on the morrow. The greater part of Thielmann's corps had fallen back on Gembloux; but, with these exceptions, the mass of the Prussians made for Tilly, near which place they bivouacked. Early on the next morning their rearguard drew off from Sombref; and, thanks to the inertness of their foes, the line of retreat remained unknown. During the march to Wavre, their columns were cheered by the sight of the dauntless old Field-Marshal, who was able to sit a horse once more. Thielmann's corps did not leave Gembloux till 2 p.m., but reached Wavre in safety. Meanwhile Bülow's powerful corps was marching unmolested from the Roman road near Hannut to a position two miles east of Wavre, where it arrived at nightfall. Equally fortunate was the reserve ammunition train, which, unnoticed by the French cavalry, wound northwards by cross-roads through Gembloux, and reached the army by 5 p.m.[496]
In his "Commentaries," written at St. Helena, Napoleon sharply criticised the action of Gneisenau in retreating northwards to Wavre, because that town is farther distant from Wellington's line of retreat than Sombref is from Quatre Bras, and is connected with it only by difficult cross-roads. He even asserted that the Prussians ought to have made for Quatre Bras, a statement which presumes that Gneisenau could have rallied his army sufficiently after Ligny to file away on the Quatre Bras chaussée in front of Napoleon's victorious legions. But the Prussian army was virtually cut in half, and could not have reunited so as to attempt the perilous flank march across Napoleon's front. We shall, therefore, probably not be far wrong if we say of this criticism that the wish was father to the thought. A march on Quatre Bras would have been a safe means of throwing away the Prussian army.[497]
To the present writer it seems probable that Gneisenau's action, in the first instance, was undertaken as the readiest means of reuniting the Prussian wings. But Gneisenau cannot have been blind to the advantages of a reunion with Wellington, which a northerly march would open out. The report which he sent to his Sovereign from Wavre shows that by that time he believed the Prussian position to be "not disadvantageous"; while in a private letter written at noon on the 17th he expressly states that the Duke will accept battle at Waterloo if the Prussians help him with two army corps. Gneisenau's only doubts seem to have been whether Wellington would fight and whether his own ammunition would be to hand in time. Until he was sure on these two points caution was certainly necessary.
The results of this prompt rally of the Prussians were infinitely enhanced by the fact that Wellington soon found it out, while Napoleon did not grasp its full import until he was in the thick of the battle of Waterloo. To the final steps that led up to this dramatic finale we must now briefly refer.
It is strange that Gneisenau, on the night of the 16th, took no steps to warn his allies of the Prussian retreat, and merely left them to infer it from his last message, that he must do so if he were not succoured. Müffling, indeed, says that a Prussian officer was sent, but was shot by the French on the British left wing. Seeing, however, that Wellington had beaten back Ney's forces before the Prussian retreat began, the story may be dismissed as a lame excuse of Gneisenau's neglect.[498]
From the risk of being crushed by Napoleon, the Anglo-Dutch forces were saved by the vigilance of their leader and the supineness of the enemy. After a brief rest at Genappe, the Duke was back at the front at dawn, and despatched two cavalry patrols towards Sombref to find out the results of the battle. The patrol, which was accompanied by the Duke's aide-de-camp, Colonel Gordon, came into touch with the Prussian rear. On his return soon after 10, the staff-officer, Basil Jackson, was at once sent to bid Picton immediately prepare to fall back on Waterloo, an order which that veteran received very sulkily.[499] Shortly after Gordon's return, a Prussian orderly galloped up and confirmed the news of their retreat, which drew from the Duke the remark: "Blücher has had a d—— d good licking and gone back to Wavre…. As he has gone back, we must go too." The infantry now began to file off by degrees behind hedges or under cover of a screen of cavalry and skirmishers, these keeping Ney's men busy in front, until the bulk of the army was well through the narrow and crowded street of Genappe.