The Defeat of Austria, 1854-59 » Napoleon III, Orsini and the Pact of Plombières

What you'll learn this session

Study time: 30 minutes

Edexcel spec: Paper 1, Depth study 2, Key topic 3

  • How nationalism in Piedmont grew in the late 1850s
  • Why Napoleon III was willing to help Piedmont, and how the Orsini Affair pushed him to act
  • What Cavour and Napoleon III agreed at Plombières in 1858
  • How Piedmont's mobilisation and Austria's ultimatum started the war in April 1859

🔒 Unlock Full Course Content

Sign up to access the complete lesson and track your progress!

Unlock This Course

Nationalism in Piedmont

By the late 1850s Piedmont was the centre of Italian nationalism. It had a parliament, a free press and thousands of exiles from the rest of Italy, and many nationalists had lost faith in Mazzini's failed risings. They began to look to Piedmont's king and army to drive Austria out.

In 1857 this hope was given an organisation, the National Society. It was founded by Daniele Manin, who had led Venice in 1848-49, Giorgio Pallavicino from Lombardy and Giuseppe La Farina from Sicily. Garibaldi joined it too. Many of its members had once been republicans, but they now accepted a king if that was the price of a free Italy. Their slogan was 'Italy and Victor Emmanuel'.

The National Society mattered because it spread support for Piedmont across northern and central Italy. Cavour could not openly back a society that wanted to overthrow other rulers, so he met La Farina in secret. Nationalism gave Piedmont the will to fight Austria. It could not give Piedmont the strength. For that, Cavour needed France.

Key terms:

  • National Society: a group founded in 1857 to unite Italy under the King of Piedmont.
  • Aggressor: the side that starts a war.
  • Confederation: a loose union of separate states, each keeping its own ruler.
  • Mobilisation: getting an army ready for war, for example by calling up reserve soldiers.
  • Ultimatum: a final demand, with a threat of war if it is refused.

Relations with Napoleon III

Napoleon III, Emperor of the French, was the one ruler with both the army and the wish to help Piedmont. His motives were mixed.

👍 Why he wanted to help

As a young man he had joined a revolt in the Papal States in 1831, and he liked to say he wanted to 'do something for Italy'. He also wanted glory for France. Driving Austria out of northern Italy would replace Austrian influence with French influence and win France new land.

👎 Why he held back

French Catholics expected him to protect the Pope, and French soldiers still guarded Rome. He did not want a strong, fully united Italy on France's border. He also feared that a war in Italy could bring other great powers in against him.

So after the Congress of Paris, Napoleon III was friendly but did nothing. It took a shock to make him act.

The Orsini Affair, 1858

On the evening of 14 January 1858, Napoleon III and the Empress Eugénie were driving to the opera in Paris. Three bombs were thrown at their carriage. Eight people were killed and about 150 were injured, but the Emperor and Empress were almost unhurt. The leader of the plot was Felice Orsini, an Italian nationalist who had served the Roman Republic in 1849. He believed that killing Napoleon III would lead to revolution in France and then in Italy.

At first the affair looked like a disaster for Cavour. Napoleon III angrily demanded that Piedmont control its revolutionaries and its newspapers. Then the mood changed. From prison, Orsini wrote to the Emperor, begging him to free Italy. Napoleon III allowed the letter to be published in France, and Cavour printed it in Piedmont's official newspaper. Orsini was guillotined on 13 March 1858, but many now saw him as a brave man who died for his country.

Why was the Orsini Affair significant?

It did not give Napoleon III the idea of helping Italy. He had that already. Its significance is that it made him act. It showed him that while Italy stayed unfree, plots against him would go on. A few months later he secretly invited Cavour to meet him.

The Pact of Plombières, July 1858

On 21 July 1858 Cavour, travelling in secret, met Napoleon III at Plombières, a small spa town in eastern France. They talked for hours, alone. Nothing was signed, but they agreed a plan.

🔥 A war against Austria

France would send about 200,000 men to fight beside 100,000 from Piedmont. There was one condition: Austria must look like the aggressor, so that the other great powers stayed out. The two men searched the map for an excuse for war.

👑 A new map of Italy

Piedmont would gain Lombardy, Venetia, Parma, Modena and part of the Papal States, making a Kingdom of Upper Italy. Tuscany would lead a new central kingdom. The Pope would keep Rome and be president of an Italian confederation. Naples would stay as it was.

💰 The price

France would receive Savoy, and Napoleon III also asked for Nice. Victor Emmanuel's daughter, Princess Clotilde, aged 15, would marry the Emperor's cousin, Prince Napoleon, who was more than twice her age.

Notice what the pact was not. It was not a plan for a united Italy. Italy would be four states, with France as its protector. In January 1859 the deal became a secret treaty, promising France both Savoy and Nice, and Clotilde's wedding took place in Turin that same month.

How the war was triggered, 1859

Cavour now had to make Austria start the war. On 10 January 1859 Victor Emmanuel II told parliament that he was not deaf to the 'cry of pain' that reached him from so many parts of Italy. Nationalists were thrilled, and Austria was alarmed.

  • March 1859: Piedmont mobilised. It called up its reserves. Thousands of volunteers crossed into Piedmont from Lombardy and other states, and Garibaldi was given command of a volunteer force. Austria sent more troops to Lombardy.
  • The plan nearly failed. Britain and Russia tried to keep the peace, and Russia proposed a congress. Napoleon III wavered, and in April he told Cavour to agree to stand his army down.
  • 23 April 1859: Austria's ultimatum. Austria could not afford to keep its army waiting, and it hoped to crush Piedmont before the French arrived. It demanded that Piedmont demobilise within three days.

This was exactly what Cavour needed. He rejected the ultimatum on 26 April, and on 29 April Austrian troops crossed the River Ticino into Piedmont. Austria was the aggressor, so Napoleon III kept his promise and France joined the war. You will see what happened next in the lesson 'The War of 1859: Magenta, Solferino and Villafranca'.

Common mistakes

  • Saying Plombières planned a united Italy. It planned four states in a confederation, with the Pope as president.
  • Saying Orsini wrecked Piedmont's friendship with France. In the end his plot pushed Napoleon III into action.
  • Saying Piedmont declared war. Piedmont provoked Austria by mobilising, but it was Austria that sent the ultimatum and invaded first.
  • Mixing up the dates. Orsini was January 1858, Plombières was July 1858 and the ultimatum was April 1859.

Exam-style question

Extract A (a practice extract written for this lesson, in the style of a modern history book)

From a modern history textbook.

At Plombières in July 1858 two men quietly carved up Italy as if it were a private estate. No parliament was told and no Italian people were asked. Lombardy and Venetia were promised to one king, Savoy was bargained away to an emperor, and a fifteen-year-old princess was thrown into the deal as the bride of a man more than twice her age. The two schemers then set about manufacturing a war, coolly searching the map for an excuse to make Austria look guilty.

What impression does the author give about the Pact of Plombières? You must use Extract A to explain your answer. [6 marks]

Model answer

The author gives the impression that the Pact of Plombières was a selfish and dishonest deal. The language makes it sound like a private bargain, not an act of freedom: Italy was 'carved up' like 'a private estate', Savoy was 'bargained away' and a princess was 'thrown into the deal', as if lands and people were goods to be traded. Calling Cavour and Napoleon III 'schemers' who were 'manufacturing a war' suggests they were underhand and cold. The author also chooses to stress the secrecy, saying 'no parliament was told' and no Italians 'were asked', and the youth of the princess. Nothing is said about the aim of driving Austria out of Italy or about support from Italian nationalists, which would have made the pact look better.

What lifts it to the top level: it names one clear impression, proves it with short quotations and explains what the words suggest, then shows what the author chose to stress and to leave out.

Exam tip

Do not use this question to show what you know about Plombières. The marks are for spotting how the author creates the impression. Look for loaded words such as 'schemers' and 'manufacturing', then ask what the author has left out. For more help, see the Exam Skills lesson 'Paper 1 Question (a): What Impression Does the Author Give?'.

Test Your Knowledge
Chat to History tutor