
The Austro-Prussian War, also known as the Seven Weeks' War, was fought between Prussia and Austria over the administration of the territories of Schleswig and Holstein, which they had jointly conquered from Denmark in 1864. Prussia was interested in gaining an alliance with Austria to defeat Denmark and settle the issue of the duchies of Schleswig and Holstein. Austria, on the other hand, wanted another ally among the small German states to support it against Prussia's ambitions. The war resulted in the exclusion of Austria from Germany and the unification of the northern German states under the North German Confederation.
| Characteristics | Values |
|---|---|
| Reason for Alliance | To defeat Denmark and settle the issue of the duchies of Schleswig and Holstein |
| Outcome of Alliance | Led to the war between Prussia and Austria |
| Outcome of War | A shift in power among the German states from Austria to Prussia, abolition of the German Confederation, annexation of four of Austria's former allies by Prussia, permanent exclusion of Austria from German affairs, Italian annexation of the Austrian realm of Venetia |
| Reason for War | Dispute over the administration of Schleswig and Holstein, which both Prussia and Austria had conquered from Denmark |
| Role of Bismarck | Manipulated the alliance to further his aim of unifying Germany under Prussian rule |
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What You'll Learn

Prussia wanted to defeat Denmark
Prussia's desire to defeat Denmark was driven by its ambition to acquire Kiel, a commodious harbour for its prospective navy. Prussia also saw the annexation of the duchies as a matter of political survival. Count Bismarck, who orchestrated the Austrian alliance during the Second Schleswig War, considered it a diplomatic "masterstroke". He deliberately weakened Austria's position in Europe and built alliances with other major powers, including Italy and France, to isolate Austria. He also made Austria look like the aggressor in the dispute.
The Austro-Prussian War, also known as the Seven Weeks' War of 1866, erupted due to the dispute between Prussia and Austria over the administration of Schleswig and Holstein. Prussia's general mobilization orders were signed in steps from May 3rd to May 12th, 1866. When Austria brought the Schleswig-Holstein dispute before the German Diet on June 1st, Prussia declared the Gastein Convention of 1865 nullified and invaded Holstein on June 9th.
The war ended in a Prussian victory, resulting in the abolition of the German Confederation and its partial replacement by the unification of northern German states in the North German Confederation, excluding Austria and other southern German states. The Treaty of Vienna, signed in October 1866, ceded the Austrian realm of Venetia to Italy.
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Austria wanted an ally against Prussia
Austria allied with Prussia to settle the issue of the duchies of Schleswig and Holstein, which were jointly occupied by the two powers after being conquered from Denmark in 1864. However, Austria's primary motivation for this alliance was its desire to gain an ally against Prussia. Austria sought to counter Prussia's growing influence and ambitions, particularly those of King Wilhelm and Bismarck.
Austria wanted to checkmate the ambitious designs of Prussia, specifically those of King Wilhelm and Bismarck. By allying with Prussia, Austria hoped to gain leverage and potentially curb Prussia's power. Prussia, on the other hand, saw the alliance as a means to isolate Austria and further its own unification goals. Bismarck, the Prussian statesman, deliberately weakened Austria's position in Europe and built alliances with other major powers, such as Italy and France, to ensure they would not aid Austria in any future conflict.
The dispute over the administration of Schleswig and Holstein provided a convenient pretext for the underlying tensions between Austria and Prussia. Prussia's refusal to address the issue through the German Bund, as it was against the Treaty of Gastein, further escalated the conflict. Austria tried to pressure Prussia using the German Bund, but this backfired as it led to the division of Austria's forces. Bismarck's diplomatic skills were evident in his ability to portray Austria as the aggressor in the dispute, justifying Prussia's eventual invasion of Holstein in 1866.
The alliance between Austria and Prussia, therefore, served as a strategic move by both parties to further their own interests. Austria sought an ally to counter Prussia's growing power, while Prussia used the alliance to isolate Austria and advance its unification agenda. The conflict culminated in the Seven Weeks' War of 1866, which resulted in a Prussian victory and the exclusion of Austria from Germany. The war also led to the abolition of the German Confederation and the consolidation of northern German states under Prussian leadership.
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Austria wanted to checkmate King Wilhelm and Bismarck's ambitions
Austria's alliance with Prussia was motivated by a desire to curb the ambitions of King Wilhelm and Bismarck. Austria sought to counter Prussia's growing influence and expansionist agenda, particularly regarding the disputed territories of Schleswig and Holstein. By allying with Prussia, Austria aimed to gain leverage and checkmate its rival's aspirations.
The dispute over Schleswig and Holstein was a significant factor in the complex power dynamics between Austria and Prussia. Both powers had jointly conquered these territories from Denmark in the Second Schleswig War in 1864 and agreed to occupy them together. However, tensions arose as Prussia, under the leadership of Bismarck, pursued its own expansionist agenda. Prussia's ambitions in the region, particularly its interest in Kiel as a prospective naval base, concerned Austria.
Austria's strategy was twofold. Firstly, they sought to pressure Prussia through the German Bund, despite this being against the terms of the Treaty of Gastein. The Bund backed Austria in the dispute, demonstrating Austria's efforts to rally support against Prussia. Secondly, Austria aimed to strengthen its position by building up its military strength in the region. This move, however, ended up dividing Austria's forces and weakening their position.
Bismarck, a shrewd politician, was aware of Austria's intentions and worked to isolate them diplomatically. He formed alliances with other major powers, such as Italy and France, making it unlikely that these countries would aid Austria in any future conflict. Bismarck also portrayed Austria as the aggressor in the territorial dispute over Schleswig and Holstein, shaping public opinion and justifying his actions.
The conflict eventually escalated into the Austro-Prussian War, also known as the Seven Weeks' War of 1866. Prussia's victory in this war resulted in the exclusion of Austria from Germany and the consolidation of its control over Schleswig and Holstein. The war also led to the Italian annexation of Venetia, formerly an Austrian realm, further diminishing Austria's influence.
In summary, Austria's alliance with Prussia regarding Schleswig and Holstein was a strategic move aimed at curbing the ambitions of King Wilhelm and Bismarck. However, Bismarck's diplomatic manoeuvres and Prussia's military might ultimately tipped the balance of power in their favour, leading to significant consequences for Austria's standing in Europe.
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Prussia wanted access to Kiel for its navy
Prussia's interest in Kiel, a commodious harbour, was well-known, and it was speculated that Prussia intended to annex not just the two duchies but all of Denmark. Prussia's desire for Kiel was likely driven by its ambition to expand its naval power. Prussia had historically focused on developing its army, with Frederick II believing that a strong army was more important than a weak fleet. However, Prussia had slowly started to build its own small fleet for coastal defence after the Napoleonic Wars, and by the 1850s, it had established its first naval base on the North Sea.
Prussia's naval ambitions became more apparent during the First War of Schleswig (1848-1851). When Denmark became the enemy, the German Confederation, which had no fleet of its own, was left vulnerable as its allies, Great Britain and the Netherlands, remained neutral. The Danish Navy swiftly halted all German maritime trade in the North and Baltic Seas. This incident highlighted the importance of naval power, and Prussia resumed its plans for a navy after the failed Revolutions of 1848.
Prussia's desire for naval expansion, including access to Kiel, was a significant factor in its alliance with Austria regarding the Schleswig and Holstein duchies. Prussia recognised the value of a fleet to support its commercial interests and protect its navigation rights. By allying with Austria, Prussia gained a strategic advantage in its quest for naval expansion, leveraging the support of another powerful state.
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Austria wanted to pressure Prussia over the Schleswig-Holstein issue
Austria sought to use the German Bund to pressure Prussia to address the issue, even though this was against the terms of the Treaty of Gastein. The Bund backed Austria in the dispute, and Austria began to build up its military strength in the region. Prussia, on the other hand, wanted to maintain control over the region, which was now part of its territory. Prussia's Minister Bismarck was determined to unify the German states and knew that war with Austria was inevitable. He deliberately weakened Austria's position in Europe by forming alliances with other major powers, such as Italy and France.
Bismarck also played a role in making Austria look like the aggressor in the dispute, diverting part of the Austrian forces to the south through his alliance with Italy. Prussia's refusal to help Poland when it rebelled against Russia in 1863 also opened up the possibility of an alliance with Russia, further isolating Austria. Prussia's goal was to gain an alliance with Austria to defeat Denmark and settle the issue of the duchies of Schleswig and Holstein. However, Prussia's true intention was to gain control of Kiel, a commodious harbor for its prospective navy.
The dispute over the administration of Schleswig and Holstein eventually led to the Seven Weeks' War in 1866 between Prussia and Austria, with Prussia ultimately emerging victorious. The war resulted in the abolition of the German Confederation and the exclusion of Austria from the unification of the northern German states. Prussia annexed Holstein and other territories, solidifying its dominance in the region.
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Frequently asked questions
Austria allied with Prussia to defeat Denmark and settle the issue of the duchies of Schleswig and Holstein.
The war resulted in the abolition of the German Confederation and the unification of all the northern German states in the North German Confederation, excluding Austria and the other southern German states.
Bismarck deliberately weakened Austria's position in Europe and built alliances with other major powers to isolate Austria. He also orchestrated the Austrian alliance during the Second Schleswig War against Denmark, which can be seen as his diplomatic masterstroke.
Italy promised to help Prussia in any war against Austria, providing Austria was the aggressor and Italy gained Venetia in return. Italy obtained Venetia by the Treaty of Vienna in 1866.


































