Battle of Königgrätz (1866): How Prussia Defeated Austria

The Battle of Königgrätz, also known as the Battle of Sadowa, was fought on 3 July 1866 in Bohemia between the armies of Prussia and of Austria and its ally Saxony. Over one day roughly half a million soldiers clashed, and the Prussians won a crushing victory. The battle decided the Austro-Prussian War, ended Austria’s long leadership in Germany and opened the way to a Prussian-led German nation-state.

Background: the struggle for Germany

Since 1815 the German states had been loosely joined in the German Confederation, presided over by Austria. Prussia, the rising power of the north, increasingly challenged that position. After the Second Schleswig War of 1864 the two powers jointly ruled the conquered duchies of Schleswig and Holstein, and quarrels over their administration gave Otto von Bismarck a pretext for war.

Bismarck prepared the ground diplomatically. He secured an alliance with Italy in April 1866, promising it Venetia, and made sure France and Russia would stay neutral. Most of the medium-sized German states, including Bavaria, Saxony and Hanover, sided with Austria.

War broke out in mid-June 1866. Prussian forces quickly overran Saxony, Hanover and Hesse-Kassel. In Italy the Austrians beat the Italians at Custoza on 24 June, but the decisive theatre was Bohemia.

Moltke’s plan and the railways

The Prussian chief of the general staff, Helmuth von Moltke, used five railway lines to move his troops rapidly to the frontier. He deployed them in three separate armies: the Elbe Army under Karl Eberhard Herwarth von Bittenfeld, the First Army under Prince Friedrich Karl, and the Second Army under Crown Prince Friedrich Wilhelm.

His principle was to “march separately, fight together”: the armies would advance into Bohemia by different routes and unite on the battlefield. Critics thought it risky, since the Austrians could in theory defeat each army in turn. The Austrian commander, Ludwig von Benedek, was a respected general but unfamiliar with the Bohemian theatre, and his army suffered a series of costly defeats in late June.

The battle

By 2 July Benedek had concentrated his army on high ground west of the Elbe near Königgrätz, with the River Bistritz in front. Moltke ordered the Elbe and First Armies to attack early on 3 July and sent messages for the Second Army to march to the battlefield as quickly as possible.

The morning went badly for the Prussians. Austrian artillery, which was more modern and better handled than Prussian guns, inflicted heavy losses along the Bistritz. In the Swiepwald, a wood in the centre, a bitter struggle drew in dozens of battalions on both sides.

Around midday the leading units of the Crown Prince’s Second Army arrived on the Austrian right flank. By mid-afternoon they had seized the village of Chlum, at the heart of Benedek’s position. With the Elbe Army also pushing on the other flank, the Austrian line collapsed.

Austrian artillery and cavalry sacrificed themselves to cover the retreat across the Elbe, and the Prussians, exhausted and disorganised, did not pursue vigorously. Even so, the Austrian army had been shattered.

The needle gun and other factors

Prussian infantry carried the Dreyse needle gun, a breech-loading rifle that could be reloaded quickly and from a lying position. Austrian infantry still used muzzle-loading Lorenz rifles and relied on bayonet charges in dense columns, which suffered terribly against rapid Prussian fire.

Historians agree the needle gun mattered, but it was only part of the story. Prussian staff work, railways, the flexibility of junior commanders and Benedek’s poor use of his strong position were equally important. On the Austrian side, the artillery performed well.

Key people

• Helmuth von Moltke: Prussian chief of staff whose plan brought three armies together on the battlefield.
• Ludwig von Benedek: Austrian commander, dismissed after the defeat; an inquiry against him was dropped on the emperor’s orders, and he agreed never to speak publicly about the campaign.
• Wilhelm I: King of Prussia, nominally in command on the field.
• Crown Prince Friedrich Wilhelm: led the Second Army whose arrival decided the day.
• Otto von Bismarck: Prussian minister-president who had engineered the war.

By the numbers

Figures vary between sources depending on how reserves and missing men are counted.

Consequences

Bismarck persuaded King Wilhelm, who wanted to march on Vienna and annex Austrian land, to offer a moderate peace. A preliminary peace was signed at Nikolsburg on 26 July, followed by the Peace of Prague on 23 August 1866.

Austria lost no territory to Prussia, but it accepted the dissolution of the German Confederation and its own exclusion from German affairs. It also gave up Venetia, which passed via France to Italy, a step in the Unification of Italy. Prussia annexed Hanover, Hesse-Kassel, Nassau, Frankfurt and Schleswig-Holstein, and formed the North German Confederation in 1867.

Weakened, Austria reached a compromise with Hungary in 1867 that created the Dual Monarchy of Austria-Hungary. In France, the sudden rise of Prussia caused alarm and talk of “revenge for Sadowa”, feeding the tensions that led to the Franco-Prussian War in 1870.

Myths and facts

Myth: the needle gun alone won the war. Rapid Prussian rifle fire caused most Austrian infantry casualties, but the Austrians had studied the weapon and knew its strengths. Their decision to rely on shock tactics, and their poor coordination at Königgrätz, turned a technical disadvantage into a disaster.

Myth: Moltke’s plan worked like clockwork. The Second Army received its orders late on the night of 2–3 July and only reached the field around midday. For several hours the Prussian centre was in real difficulty, and a more aggressive Austrian counter-attack might have changed the outcome.

Fact: Bismarck’s moderation was deliberate. Bismarck argued that a humiliated Austria would become a permanent enemy, while a defeated but intact Austria might later become a partner. Germany and Austria-Hungary did indeed form an alliance in 1879.

Legacy

Königgrätz made Moltke’s general staff the model for armies around the world. Railways, the telegraph and careful planning were now seen as essential to modern warfare, and other powers hurried to adopt breech-loading rifles. France introduced the Chassepot rifle in the same year.

The battle also changed how Europeans saw Prussia. A state long regarded as the weakest of the great powers had defeated the ancient Habsburg monarchy in a few weeks. The march “Der Königgrätzer Marsch” by Johann Gottfried Piefke, written to celebrate the victory, became one of the best-known German military marches.

In the Czech Republic the battlefield near Hradec Králové is preserved with memorials, cemeteries and a museum at Chlum, and re-enactments are held on anniversaries. Many of the soldiers who died on the Austrian side were themselves Czechs, Hungarians, Poles and other subjects of the Habsburg monarchy.

Timeline

• 1866, 8 April: Prussia signs an alliance with Italy.
• 1866, mid-June: War begins; Prussia invades Saxony, Hanover and Hesse-Kassel.
• 1866, 24 June: Austria defeats Italy at Custoza.
• 1866, 3 July: Battle of Königgrätz.
• 1866, 26 July: Preliminary peace of Nikolsburg.
• 1866, 23 August: Peace of Prague.

Why it matters

Königgrätz settled the question of whether Austria or Prussia would lead Germany. Without it, the Prussian-dominated German Empire proclaimed in 1871 would hardly have been possible, and the balance of power in Europe would have looked very different.