Marshal Grouchy at Waterloo: How Napoleon Bonaparte's Delay Lost the Battle

Napoleon's Waterloo Opening Gambit (0:00)

Hey, chibis! I'm Aiwee, and today we're talking about the four-hour delay that doomed Napoleon at Waterloo. If you enjoy stories like this, hit the like button and subscribe if you haven't already — let's go! On Sunday, the eighteenth of June, eighteen fifteen, seventy-two thousand French soldiers and two hundred and fifty artillery pieces assembled in the sodden fields near an inn called La Belle Alliance. Ahead of them, across a shallow valley, the Duke of Wellington stood with sixty-eight thousand allied troops and one hundred and fifty guns.

Within twelve hours, that French army would dissolve into a disorderly retreat, abandoning two hundred and twenty cannons, surrendering two imperial eagle standards, and shouting a phrase never before heard on a Napoleonic battlefield: the Guard is falling back. Napoleon Bonaparte did not lose his final campaign because of a single dramatic blunder. Instead, Waterloo was decided by a compressed chain of choices made against an unforgiving clock. Over the course of one day, the distance of marching columns, the physical resistance of deep mud, and the failure of French reconnaissance turned every tactical delay into a fatal liability. The trouble began at dawn.

Meeting his senior commanders at Le Caillou farmhouse, Napoleon planned to drive Wellington from his ridge south of Waterloo and open the road to Brussels. Nearly thirty-six hours had passed since the French defeated the Prussians at Ligny, while Marshal Ney checked Wellington at Quatre Bras. Believing the Prussian army was scattered and retreating along its supply lines, Napoleon had detached Marshal Grouchy with thirty-three thousand men to pursue them. In reality, the Prussian commander, Prince Blucher, was not retreating away from Wellington. He had directed his army north toward Wavre, placing them in position to march directly to Wellington's aid.

Napoleon could have ordered Grouchy to cross the Dyle River and sever this line of march, but he dismissed the possibility, confident that Blucher was neutralised. In fact, Blucher had already committed two full corps to the road west. Back at Le Caillou, General Drouot advised that the French artillery assault be postponed until late morning. Cannonballs inflicted maximum damage by skipping across hard ground like stones across water, and the fields were still waterlogged from torrential overnight rain. Furthermore, General Lobau's Sixth Corps, the Imperial Guard, and the reserve ammunition trains were still labouring along muddy approach roads.

Napoleon agreed to wait. That decision cost the French army nearly four precious hours. Across the valley, Wellington used those four hours to perfect his defence. His position spanned barely three miles, bounded by broken terrain that restricted French maneuver. He deployed the majority of his Anglo-Allied force on the reverse slope of a low ridge, hiding them from direct view and sheltering them from artillery fire.

Expecting Prussian support on his left, he weighted his right flank and stationed seventeen thousand men eight miles away at Halle to guard against an outflanking move. Wellington anchored his forward line with three fortified outposts: the farmhouses of Papelotte, La Haye Sainte, and the sprawling complex of Hougoumont. These positions acted like breakwaters, designed to channel French assaults into narrow killing zones. Hougoumont, on the allied right, was garrisoned by thirteen hundred men of the Coldstream Guards and the Second Nassau Regiment. At around eleven thirty in the morning, the battle began with an attack by Prince Jerome's division of four thousand infantry against Hougoumont.

Napoleon intended this as a diversion to force Wellington to burn his reserves. It did the exact opposite. When thirty French soldiers forced their way through the northern gate, the defenders shut it behind them and killed every man inside. Wellington fed fresh ammunition and reinforcements along a protected sunken road, while the French poured in division after division. What was meant to be a minor diversion rapidly swallowed ten thousand French infantry, all pinned down by just three thousand allied defenders.

As the struggle around the burning chateau dragged on, French staff officers scanning the distant eastern horizon noticed dark formations emerging through the woods. Scouts confirmed the worst: it was Bulow's Prussian corps, twenty-five thousand strong, advancing directly toward the exposed French right flank. Napoleon scribbled an urgent dispatch to Grouchy, ordering him to close in and intercept the Prussians. Then, at one in the afternoon, he ordered his main assault on Wellington's center. Eighty heavy guns, assembled into a massive Grand Battery, opened fire along the ridge.

By one estimate, the French guns discharged up to one hundred and fifty rounds per minute. Yet because Wellington's men were sheltered behind the crest, the bombardment caused far less destruction than expected. Thirty minutes later, General d'Erlon launched twenty thousand men of the First Corps across the valley in four dense columns. British artillery tore bloody swathes through their packed ranks, but the French pressed forward, threatening La Haye Sainte and reaching the crest of the ridge. Forward allied units wavered, and General Picton was killed as he led his division into a desperate firefight.

At that critical moment, Lord Uxbridge unleashed two thousand British heavy cavalry from the Household and Union brigades. Crashing through the crest, the horsemen struck d'Erlon's disordered columns with devastating force. Scores of French soldiers fell, hundreds more were taken prisoner, two imperial eagle standards were captured, and thousands fled. Carried away by their success, the British horsemen charged across the valley toward the Grand Battery. But without infantry support or spiked nails to disable the cannons, they were quickly exhausted and stranded.

Dawn at Le Caillou Farmhouse (6:30)

French cuirassiers and lancers counterattacked, killing General Ponsonby and cutting down more than half of the British heavy cavalry before they could regain their lines. With d'Erlon's corps shattered and Lobau's fresh troops still arriving, Napoleon needed to pin Wellington in place. At four in the afternoon, Marshal Ney gathered six thousand cavalry and launched them up the ridge. Because of the sodden ground, the horses could advance at little more than a trot. Wellington promptly ordered his infantry into defensive hollow squares.

Ney led charge after charge against the allied squares, with some counts recording as many as fifteen separate assaults. When the cavalry wheeled back, the Grand Battery hammered the static infantry formations, inflicting heavy casualties. Yet Ney failed to bring forward supporting infantry or artillery, leaving four thousand French infantry standing idle without orders. Even when reinforced by Kellermann's heavy cavalry, horsemen alone could not break the bristling walls of bayonets. Ten miles to the east, Marshal Grouchy reached the village of Wavre around four in the afternoon.

Hearing the heavy rumble of cannons from Waterloo, General Gerard urged Grouchy to march immediately to the sound of the guns. Grouchy refused, stating that his duty was to follow the Emperor's written instructions to pursue the Prussians before him. Unbeknownst to Grouchy, he was attacking only a single Prussian rearguard corps, while three other Prussian corps pressed toward the battle, their progress slowed by the narrow lanes. By mid-afternoon, Bulow's Prussians attacked the village of Plancenoit, deep on Napoleon's right flank. The French situation was growing perilous.

Napoleon had to divert Lobau's Sixth Corps, followed by four thousand men of the Young Guard, into a brutal house-to-house battle for the burning village. When the Prussians took Plancenoit, Napoleon was forced to commit two battalions of his elite Old Guard to recapture the town with cold steel. Around six in the evening, French infantry finally scored a breakthrough at the center of the battlefield. Supported by close-range artillery, they captured the smouldering farmhouse of La Haye Sainte after its defenders, the King's German Legion, exhausted their ammunition. Out of the original garrison, only one in ten returned to the allied line unharmed.

The fall of La Haye Sainte gave the French an artillery platform just yards from Wellington's center. An immediate, all-out assault might have cracked the allied line, but Napoleon could not risk it while Plancenoit hung in the balance. Only after his Old Guard stabilized the right flank could he turn back to Wellington. By then, it was seven in the evening. Napoleon had only one card left to play: eleven fresh battalions of the Imperial Guard, roughly six thousand men.

Advancing across half a mile of open ground with drums beating, the Guard marched past La Haye Sainte. To bolster their morale, Napoleon circulated word that Grouchy had arrived on the right. Wellington had concealed his remaining Foot Guards lying flat in the tall corn along the crest. When the leading French columns reached the ridge around seven fifteen, Wellington gave the command. The British guards sprang up and delivered a crushing volley at point-blank range, killing General Michel.

When the British charged with bayonets, the French columns stalled. On the French right, the remaining Guard columns pushed forward, only to be struck in the flank by General Chasse's Third Netherlands Division and General Adam's brigade. Caught in a converging crossfire and seeing their comrades retreating, the veterans broke. Across the field, the cry spread in disbelief: the Guard is falling back. Seeing the French line collapse, Wellington rode to the edge of the crest and waved his hat three times into the evening air.

At eight in the evening, the entire allied line surged forward in a general advance. Simultaneously, fresh Prussian corps under General Pirch assaulted Plancenoit, driving out the last French defenders. Hougoumont sallied forth, and French cohesion shattered into an outright rout. Napoleon took refuge inside a square formed by Old Guard grenadiers, but the rout was unstoppable. Remarking to his staff that the day was lost, he abandoned the field.

Close to Le Caillou farmhouse, Wellington and Blucher met on horseback and embraced, having shattered Napoleon's army in a single afternoon. The human cost was staggering. Wellington's army suffered more than fourteen thousand casualties, the Prussians lost around seven thousand, and the French Armée du Nord lost about twenty-five thousand killed, wounded, or captured. By some estimates, the four days of the campaign claimed up to one hundred thousand casualties across all armies. The following day, Scottish businessman Thomas Ker visited the battlefield and described an appalling absence of water and medical aid, recording scenes where allied and French wounded lay side by side, calling out for help.

Napoleon fled south through Genappe, where traffic jams forced him to abandon his imperial carriage and flee on horseback. Barely one hundred days after returning from exile, his empire was permanently over. Today, the battlefield south of Brussels remains an active place of remembrance and research. Since twenty fifteen, the archaeological project Waterloo Uncovered has supported more than three hundred and fifty veterans while uncovering over six thousand five hundred artifacts, including live howitzer shells, musket balls, and complete human remains. Waterloo was not decided by tactical genius or sudden cowardice, but by the relentless mathematics of distance, terrain, and time.

The Four-Hour Artillery Delay (12:45)

When Napoleon delayed his opening bombardment by four hours, he wagered that he could destroy Wellington before the Prussians arrived. That calculation proved wrong, and any hope of intervention at Waterloo died. If you found this breakdown of the decisions and realities of Waterloo valuable, consider subscribing for more evidence-led historical reconstructions, and share your perspective in the comments below.