The site of the battle on June 18 comprised two low ridges separated by a valley that was at no point more than 1,200 yards (1.1 km) in breadth. Wellington’s first line of defense was an unpaved road from Braine-l’Alleud, which ran just south of the village of Mont-Saint-Jean along the crest of the northern ridge. Its thick hedges offered excellent cover, and most of Wellington’s troops were placed on the ridge’s reverse slope to shelter them from the French artillery. Two advance posts located about 500 yards (450 metres) in front of the main line added greatly to the natural strength of the position and proved critical in the battle to come: the château and its grounds at Hougoumont and, roughly 1,100 yards (1 km) to its east, the farm and sandpit at La Haye Sainte. Less important outposts were at the farms of La Haye and Papelotte, farther to the east. Although Wellington had made expert use of the terrain, his 67,661 men and 156 guns would barely suffice to preserve his front until evening against Napoleon’s 71,947 men and 246 guns. Napoleon drew up his forces on the southern ridge centred on La Belle Alliance, 1,200 yards (1.1 km) south of Wellington’s position.

Before assaulting the centre of the British line, Napoleon ordered a diversion against Hougoumont. The sodden ground compelled Napoleon to delay the start of hostilities, and at 11:35 am the first shots of the Battle of Waterloo were fired by one of Marshal Honoré Charles Reille’s artillery divisions. Thus began a mismanaged attack on the château which would absorb increasing numbers of French troops without drawing defenders from Wellington’s centre. For an hour and a half the battle was confined to Hougoumont. At 1 pm, when he was about to instruct the great battery of 80 guns near La Belle Alliance to cannonade the enemy centre, the emperor perceived a mass of troops emerging from the woods of Chapelle Saint-Lambert, 6 miles (10 km) to the northeast. He soon learned that it was the IV Corps (30,000 strong) of Friedrich Wilhelm, Freiherr (baron) von Bülow, and that it was being followed by the bulk of the Prussian army. A hurried dispatch was sent to Grouchy, ordering him to rejoin the main body of the French army and engage Bülow, but the message did not reach him until 5:00 pm. By that point, Grouchy had become completely entangled with Johann Adolf Thielmann’s III Corps at Wavre, and, even if he had been free to march at once, he could not have reached Napoleon until well after nightfall.

Napoleon still hoped to defeat Wellington before the Prussians could arrive in force. Two cavalry divisions were sent to form a screen in Bülow’s path, and a corps under Georges Mouton, count de Lobau, was placed behind them. By 1:30 pm those arrangements had been completed. The battery near La Belle Alliance opened fire, and 18,000 infantry under Ney and Drouet advanced on the allied centre a half hour later. No cavalry accompanied the attack, and the British infantry met Drouet’s men with maximum firepower. Many of the attackers marched in an unusual formation: in three divisional columns, 200 men wide and 24–27 ranks deep. Thus, they were unable to return fire effectively and were very vulnerable to artillery. La Haye Sainte was attacked but not taken, and Papelotte was occupied. Wellington’s cavalry commander, Henry Paget, earl of Uxbridge (later 1st marquess of Anglesey), now threw his horsemen against the disorganized French columns and the numerically inferior cavalry coming up behind. The French withdrew from Papelotte in good order, but elsewhere they failed to stem the advance of the enemy horsemen. Flushed with success, Lord Edward Somerset and Sir William Ponsonby’s cavalry ignored Uxbridge’s call to return and charged the French lines. Ponsonby was killed and 2,500 English horsemen—a third of those taking part—were lost in a largely pointless action. In spite of that reverse, Wellington had surmounted the first crisis. Drouet’s corps had been driven back from the slopes before the British lines with severe casualties and the loss of 3,000 prisoners.

It was now 3:00 pm, and the intensity of the fighting briefly slackened. The exception was at Hougoumont, where 1,200 allied troops continued to hold off many times their number of French. Napoleon ordered Ney to seize La Haye Sainte quickly in preparation for an assault by Drouet’s and Reille’s corps and elements of the Imperial Guard. The two brigades of infantry that Ney dispatched to La Haye Sainte were repulsed, and Ney then committed the bulk of the French cavalry to a fatally dangerous course of action. Mistaking the movement of wounded men and empty ammunition wagons from Wellington’s centre for a weakening of the front, just after 4:00 pm Ney brought up Édouard-Jean-Baptiste Milhaud’s two divisions of cavalry to seize, as he thought, that chance of deciding the battle. Worse still, without consulting his superiors, Charles Lefebvre-Desnouettes ordered his cavalry division to follow Milhaud. The British responded by forming infantry squares—hollow defensive formations several ranks deep that had proven to be especially effective at breaking cavalry charges. Although the French horsemen were extremely determined, a massed cavalry attack had little chance of success when delivered virtually without infantry and close artillery support against unbroken English squares. English gunners took a heavy toll of the 5,000 cuirassiers (heavy cavalry) mounting the slopes between Hougoumont and La Haye Sainte. Driven off by Uxbridge’s remaining cavalry, the cuirassiers reformed, but their second attack also failed. Although very critical of Ney’s premature use of unaccompanied cavalry, Napoleon decided to stand by Ney’s action. François-Étienne Kellermann’s two cavalry divisions were sent to support Ney, and they were joined—possibly without Napoleon’s orders—by Claude-Étienne Guyot’s division of cavalry from the Guard. There were now 9,000 cavalry about to attack on a front reduced to 500 yards (450 metres) by the zones of fire around Hougoumont and La Haye Sainte.

Meanwhile, on the French right flank, at about 4:30 pm and after an 11-hour march through difficult country, Bülow’s leading divisions opened fire from Paris Wood on the French cavalry screen. Lobau resolved to engage the Prussians before Bülow could deploy the rest of his force, and he held his ground, though increasingly outnumbered. Blücher, who had accompanied Bülow’s corps, switched the Prussian attack to Plancenoit, forcing Lobau to fall back and detach a brigade to defend the village. Sheer numbers eventually forced the French out of Plancenoit, and Napoleon dispatched Philippe-Guillaume Duhesme’s division of the Young Guard to recover it. Duhesme’s success there relieved the pressure on the French right flank for the moment.

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