
The Austro-Prussian War, also known as the Seven Weeks' War, was fought in 1866 between the Austrian Empire and the Kingdom of Prussia, with both sides aided by various allies within the German Confederation. The war was the result of a dispute between Prussia and Austria over the administration of Schleswig-Holstein, which they had conquered from Denmark and agreed to jointly occupy at the end of the Second Schleswig War in 1864. The war ended in a Prussian victory, shifting the balance of power among the German states away from Austria and towards Prussia, and resulting in the exclusion of Austria from Germany.
| Characteristics | Values |
|---|---|
| Date | 1866 |
| Combatants | Prussia, Kingdom of Italy, Oldenburg, Mecklenburg-Schwerin, Mecklenburg-Strelitz, and Brunswick vs. Austrian Empire, Bavaria, Saxony, Hanover, Hesse-Kassel, Hesse-Darmstadt, Nassau, and other minor German states |
| Outcome | Prussian victory; shift in power among German states towards Prussian hegemony |
| Impact | Abolition of the German Confederation; unification of northern German states in the North German Confederation excluding Austria and other southern German states; impetus towards Italian unification |
| Causes | Dispute over administration of Schleswig-Holstein; rivalry between Austria and Prussia for dominance over German states |
| Technology | Prussian infantry equipped with Dreyse needle gun; Austrian army used breech-loading rifled cannon and Lenk system artillery |
| Tactics | Prussian advantage due to modernized army discipline; Austrian use of Stoßtaktik ("shock tactics") |
| Treaty | Treaty of Prague signed on August 23, 1866, assigning Schleswig-Holstein to Prussia and ceding Venetia to Italy |
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What You'll Learn

The war was called the 'Austro-Prussian War'
The war between Prussia and Austria was called the Austro-Prussian War, also known as the Seven Weeks' War, the German Civil War, the Unification War, the War of 1866, the Fraternal War, the German War, and the Bruderkrieg (War of Brothers). It was fought in 1866 between the Austrian Empire and the Kingdom of Prussia, with both sides aided by various allies within the German Confederation.
The Austro-Prussian War was the culmination of the rivalry between Austria and Prussia, with both contesting for supremacy in Germany. Prussia, which had become one of the great powers of Europe, sought to unite Germany under its rule, while Austria, traditionally considered the leader of the German states, wanted to maintain its dominance. The immediate cause of the war was a dispute over the administration of Schleswig-Holstein, which both Prussia and Austria had conquered from Denmark and agreed to jointly occupy at the end of the Second Schleswig War in 1864.
Prussia, led by Chancellor Otto von Bismarck, allied itself with the Kingdom of Italy, linking the conflict to the Third Independence War of Italian unification. Italy joined Prussia due to Austria's occupation of Venetia, which the Italians wanted for their unification. Prussia also secured the neutrality of France, while other foreign powers, like Russia, abstained from the war. Prussia's army was better trained and equipped, making use of breech-loading rifles and the Dreyse needle gun, a bolt-action rifle that could be fired faster than the Austrian muzzle-loading rifles.
The war ended in a Prussian victory, formalized by the Treaty of Prague on August 23, 1866. The treaty assigned Schleswig-Holstein to Prussia, and Prussia also annexed several smaller German states, forming the North German Confederation. The German Confederation was abolished, and Austria was excluded from its territories in the south and lost political influence in the north. This shift in power among the German states marked the end of Austrian hegemony and the start of Prussian dominance, setting the stage for the unification of Germany under Prussia's leadership.
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It lasted seven weeks and ended in 1866
The Austro-Prussian War, also known as the Seven Weeks' War, lasted seven weeks and ended in 1866. The war was fought between the Austrian Empire and the Kingdom of Prussia, with both sides aided by various allies within the German Confederation. Prussia was also allied with the Kingdom of Italy, linking the conflict to the Third Independence War of Italian unification.
The war was a result of the rivalry between Austria and Prussia, with Prussia challenging Austria's supremacy in the German Confederation. Prussia had become increasingly powerful and was considered one of the great powers of Europe. The immediate cause of the war was a dispute over the administration of Schleswig-Holstein, which both Prussia and Austria had conquered from Denmark and agreed to jointly occupy at the end of the Second Schleswig War in 1864.
The war began on 15 June 1866, with Prussia's invasion of Hanover, Saxony, and the Electorate of Hesse. Italy, allied with Prussia, declared war on Austria on 20 June. The Prussian army, better trained and equipped, defeated the main Austrian army at Sadowa. Seven weeks after the start of the war, the Austrians signed the Treaty of Prague, formally ending the conflict.
The war resulted in a shift in power among the German states away from Austria and towards Prussia, leading to the unification of the northern German states in the North German Confederation, which excluded Austria and the other southern German states. Prussia's victory enabled it to annex several smaller states and consolidate its dominance over Germany.
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Prussia was aided by the Kingdom of Italy
The conflict between Prussia and Austria, known as the Austro-Prussian War or the Seven Weeks' War, took place in 1866. Prussia was aided by the Kingdom of Italy, which sought to further the process of Italian unification. The Italian government signed a military alliance with Prussia, agreeing to engage the Austrians on the southern front. This alliance was facilitated by French Emperor Napoleon III, who acted as an intermediary between the two parties.
The Italo-Prussian alliance was formed on 8 April 1866, with Prussia committing to war against Austria within three months. This timing was strategic, as other European powers were unable to intervene due to diplomatic relations or domestic issues. Italy's participation in the war was linked to the Third Independence War of Italian unification, as they sought to capture the region of Venetia from Austria. Italy's acquisition of this territory represented a significant step in the unification of the country.
Italy's involvement in the war included deploying two armies, one led by General Alfonso Ferrero La Marmora in Lombardy and the other under Enrico Cialdini in Romagna. However, La Marmora's forces suffered a defeat at the Battle of Custoza on 24 June 1866, forcing them to retreat. Despite this setback, Prussia's victory in Bohemia, particularly at the Battle of Königgrätz, compelled the Austrians to redeploy their forces, easing the pressure on the Italians.
The alliance with Italy provided a strategic advantage for Prussia, as it forced Austria to divide its attention and resources between two fronts. Italy's numerical superiority and geographic tactical advantages also contributed to the overall success of the alliance. The diversion of Austrian forces to the south, combined with Prussia's modernized army discipline, ultimately led to a Prussian victory in the war. As a result of the Peace of Vienna, Austria ceded Venetia to Italy, which was later annexed through a plebiscite.
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The war was over the administration of Schleswig-Holstein
The Austro-Prussian War, also known as the Seven Weeks' War, was fought in 1866 between the Austrian Empire and the Kingdom of Prussia, with both sides aided by various allies within the German Confederation. Prussia also formed an alliance with the Kingdom of Italy, linking the conflict to the Third Independence War of Italian unification. The war was the result of a dispute between Prussia and Austria over the administration of Schleswig and Holstein, which they had conquered from Denmark and agreed to jointly occupy at the end of the Second Schleswig War in 1864.
The Second Schleswig War was the second military conflict over the administration of Schleswig and Holstein in the nineteenth century. The war began on 1 February 1864, when Prussian and Austrian forces crossed the border into the Danish fiefdom of Schleswig. Denmark fought against the troops of the Kingdom of Prussia and the Austrian Empire, representing the German Confederation. The war was fought for control of the duchies of Schleswig, Holstein, and Lauenburg. Succession disputes concerning the duchies arose when the Danish king died without an heir acceptable to the German Confederation. The war started after the passing of the November Constitution of 1863, which tied the Duchy of Schleswig more closely to the Danish kingdom, which was viewed by the German side as a violation of the London Protocol.
The Convention of Gastein, which came into effect on 14 August 1865, assigned the internal administration of Holstein to Austria and that of Schleswig to Prussia. However, this arrangement was short-lived, and the conflict over supremacy within Germany led to the Seven Weeks' War between Austria and Prussia. The crisis started on 26 January 1866, when Prussia protested the decision of the Austrian Governor of Holstein to permit the estates of the duchies to call up a united assembly, declaring the Austrian decision a breach of the principle of joint sovereignty. Austria replied on 7 February, asserting that its decision did not infringe on Prussia's rights in the duchies. In March 1866, Austria reinforced its troops along its frontier with Prussia, and the Kingdom responded with a partial mobilisation of five divisions on 28 March.
The Peace of Prague, which came into effect on 23 August 1866, ceded the duchies to Prussia, and after Prussia’s formation of the German Empire in 1871, the dispute over Schleswig and Holstein was narrowed to a contest between Denmark and Germany over North Schleswig. The Prussian victory in the Austro-Prussian War resulted in a shift in power among the German states away from Austrian and towards Prussian hegemony, leading to the abolition of the German Confederation and its partial replacement by the unification of all the northern German states in the North German Confederation, which excluded Austria and the other southern German states.
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The war resulted in Prussian dominance over the German states
The Austro-Prussian War, also known as the Seven Weeks' War, was fought in 1866 between the Austrian Empire and the Kingdom of Prussia, with both sides aided by various allies within the German Confederation. The war resulted in Prussian dominance over the German states, shifting power away from Austrian hegemony. Prussia's victory was a result of its alliance with Italy, which diverted Austrian forces to the south, and its modernized army discipline.
Prussia's growing power and contestation of Austrian supremacy in Germany since at least 1850 set the stage for the rivalry between the two states. The immediate cause of the war was the dispute over the administration of Schleswig-Holstein, which both Prussia and Austria had conquered from Denmark in 1864. Prussia protested the decision of the Austrian Governor of Holstein to allow the estates of the duchies to call a united assembly, claiming it breached joint sovereignty. Despite Austria's reassurances, Prussia partially mobilized five divisions in March 1866, leading to a Prussian-Italian alliance and ultimately, war.
Prussia's alliance with Italy linked the Austro-Prussian conflict to the Third Independence War of Italian unification. Italy's attack on Venetia in the south forced Austria to divide its forces, giving Prussia a strategic advantage. Additionally, Prussia's rapidly growing economy, aided by the German customs union, provided the resources for its modernized army, which was equipped with breech-loading rifles and Krupp breech-loading artillery. In contrast, the Austrian economy was suffering from the effects of the Hungarian Revolution of 1848 and the Second Italian War of Independence, leaving the state heavily indebted.
The war concluded on August 23, 1866, with the Treaty of Prague, which assigned Schleswig-Holstein to Prussia. Prussia also annexed Hanover, Hesse-Kassel, Nassau, and Frankfurt, unifying the northern German states under the North German Confederation. The German Confederation was abolished, and Austria was permanently excluded from German affairs, ceding control of its Venetian territory to Italy. Prussia's victory solidified its dominance over the German states, reshaping the power dynamics within Germany.
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Frequently asked questions
The war between Prussia and Austria was called the Austro-Prussian War, also known as the Seven Weeks' War, the German Civil War, the Unification War, the War of 1866, the Fraternal War, and the German War.
The Austro-Prussian War took place in 1866.
The war was fought between the Austrian Empire and the Kingdom of Prussia, with both sides aided by various allies within the German Confederation. Prussia was also allied with the Kingdom of Italy, linking the conflict to the Third Independence War of Italian unification.
The war erupted due to a dispute between Prussia and Austria over the administration of Schleswig-Holstein, which they had jointly conquered from Denmark in the Second Schleswig War in 1864. The immediate trigger was a disagreement over the decision of the Austrian Governor of Holstein to allow the estates of the duchies to call a united assembly, which Prussia saw as a breach of joint sovereignty.
The war resulted in a Prussian victory and a shift in power among the German states. Prussia gained dominance over the German states, while Austria was excluded from its territories in the south and lost political influence in the north. The German Confederation was abolished, and the northern German states were unified in the North German Confederation, excluding Austria and the other southern German states.

































