In the early morning mist of September first, 1870, across a bowl shaped valley loop of the Meuse River near the northern French border with Belgium, the armies of the Second French Empire and the Prussian led German coalition collided in one of the most decisive battles of modern history. In less than fifteen hours of ferocious artillery bombardment and desperate infantry and cavalry clashes, the Battle of Sedan resulted in the capture of Emperor Napoleon III, the destruction of France’s last operational field army, the fall of the Bonapartist dynasty, and the birth of the unified German Empire as continental Europe’s dominant military superpower.
Strategic Blunders and the March Into a Trap
When France declared war on Prussia in July 1870, Emperor Napoleon III and his generals expected a rapid offensive into German territory. Instead, the brilliant Prussian Chief of the General Staff, Helmuth von Moltke the Elder, mobilized over four hundred thousand German troops via coordinated rail networks and seized the initiative immediately. By mid August, following brutal frontier battles at Spicheren, Worth, and Gravelotte Saint Privat, France’s primary fighting force—the Army of the Rhine under Marshal Achille Bazaine—was completely surrounded and besieged inside the fortress of Metz.
With Bazaine trapped, French Marshal Patrice de MacMahon assembled the four corps of the newly formed Army of Chalons, numbering roughly one hundred and twenty thousand men and five hundred and sixty guns, accompanied personally by the ailing, kidney stone afflicted Emperor Napoleon III. Militarily, MacMahon knew the smartest move was to fall back westward to defend Paris. However, Empress Eugenie and the cabinet in Paris telegraphed a stern warning: if the Emperor abandoned Bazaine and retreated to Paris, a revolution would immediately break out in the streets. Against his better judgment, MacMahon marched his slow, supply burdened army northeastward toward Metz, marching parallel to the Belgian border right as Moltke wheeled two massive German armies—the Third Army under Crown Prince Frederick and the Army of the Meuse under Crown Prince Albert of Saxony—northward in a giant right hook to pin the French against the frontier.
Pinned in the Cauldon of Sedan and the Wound of MacMahon
Exhausted after a defeat at Beaumont on August thirtieth, MacMahon pulled his army into the fortified town of Sedan on August thirty first to rest his men and distribute ammunition. Geographically, Sedan was a death trap: the town sat at the bottom of a low basin surrounded on every side by steep wooded ridges and hills that looked straight down into the French positions. Overnight, while the French rested, Moltke’s German corps marched silently around both flanks across the Meuse River to occupy the high ground, closing a complete circle around the French army.
Fighting erupted at four o’clock in the morning on September first in heavy fog around the southeastern village of Bazeilles. There, elite French Marine Infantry fought house to house with extraordinary tenacity against Bavarian troops for six hours until every building was in flames. Around six o’clock that morning, while riding forward to observe the fighting at Bazeilles, Marshal MacMahon was struck in the hip by a fragment from a German artillery shell. His injury triggered a disastrous three way confusion in the French high command: MacMahon handed command to General Auguste Alexandre Ducrot, who immediately ordered a wise retreat westward toward Mezieres before the German ring closed completely; yet barely an hour later, General Emmanuel Felix de Wimpffen—who had arrived from Algeria just two days earlier carrying a secret letter from the War Ministry naming him successor if MacMahon fell—pulled rank on Ducrot and canceled the retreat, ordering the troops to march back into their old positions right as the last gap in the German encirclement slammed shut at noon.
Krupp Steel Artillery and the Brave People of Margueritte’s Cavalry
Once the German infantry linked hands at the village of Illy to the north, Moltke unleashed the full terror of modern industrial artillery. Positioned along the circular rim of hills overlooking the Sedan valley were more than five hundred German breech loading steel Krupp cannons, which outranged, outfired, and exploded on impact with far greater lethality than France’s older bronze muzzle loading cannons. From thirty six0 degrees around the compass, German batteries poured a relentless crossfire of explosive shells down into the crowded two square mile pocket of the Bois de la Garenne, slaughtering whole French battalions that could not even see the guns firing at them.
In the early afternoon, trapped on the western plateau of Floing and facing annihilation, General Ducrot ordered General Jean Auguste Margueritte’s division of Chasseurs d’Afrique—French light cavalry—to charge the Prussian infantry and artillery lines to buy time for a breakout. Just before leading the charge, Margueritte rode forward to reconnoiter and was shot through both cheeks, tearing away his jaw and tongue so he could only wave his arm toward the enemy. Three separate times, the French horsemen galloped across bullet swept slopes straight into the rapid fire of Prussian Dreyse needle guns, being mowed down in heaps just yards from the German muzzles. Watching the suicidal valor through his field glasses from the hillside of Frenois, King Wilhelm I of Prussia was moved to murmur aloud in admiration: “Ah, the brave people!” (Oh! Les braves gens!).
The White Flag and the Surrender of an Emperor
By late afternoon, remnants of the shattered French regiments were pouring back inside the medieval stone walls of Sedan in chaos, while Emperor Napoleon III—who had ridden out under shellfire for four hours hoping a stray bullet would end his suffering—returned to the citadel. When General Wimpffen proposed one more suicidal breakout over the bodies of the wounded, Napoleon III refused to sacrifice another life and ordered the white flag raised over the fortress ramparts.
That evening, the Emperor wrote a two sentence note to King Wilhelm I of Prussia: “Monsieur my brother, having been unable to die in the midst of my troops, nothing remains for me but to place my sword in the hands of Your Majesty.” On the morning of September second, 1870, Napoleon III rode out in a carriage to meet Prussian Chancellor Otto von Bismarck at a weaver’s cottage in Donchery, and subsequently met King Wilhelm at the Chateau de Bellevue. Under the formal capitulation, Napoleon III, thirty nine generals, and over one hundred and four thousand French soldiers became prisoners of war, alongside seventeen thousand dead and wounded. Two days later, Paris overthrew the Empire and proclaimed the Third Republic, while four months later in January 1871, King Wilhelm I stood inside the Hall of Mirrors at the Palace of Versailles to be proclaimed German Emperor—a direct legacy of the afternoon the guns fell silent at Sedan.
