Invasion of Portugal by French and Spanish forces in 1807
The invasion of Portugal by French and Spanish forces in 1807 was a critical event in the Napoleonic Wars that marked the beginning of the Peninsular War, reshaping the political and military landscape of Europe.
Sparked by Napoleon Bonaparte’s ambitions and Portugal’s longstanding alliance with Britain, the invasion had profound consequences for Portugal, Spain, and the broader struggle against French hegemony.
The occupation of Portugal, though initially successful, ultimately triggered widespread resistance and British intervention, contributing significantly to Napoleon’s eventual downfall.
Background: Geopolitical Context
The Franco-Spanish invasion of Portugal and its aftermath were instrumental in shaping the political and military landscape of the Napoleonic Wars and the eventual reshaping of the Portuguese Empire. Image: A depiction of France’s invasion of Portugal by Luis António Xavier.
Portugal’s Strategic Importance
Portugal held a unique position in Europe due to its geographical location and historical ties with Britain. For centuries, Portugal and Britain had been allies, with the Treaty of Windsor (1386) forming the foundation of their enduring relationship. This alliance provided Britain with access to Portuguese ports, particularly Lisbon, which served as vital bases for the Royal Navy during operations against France.
Additionally, trade between Britain and Portugal, including its colony in Brazil, flourished, further antagonizing Napoleon, who sought to isolate Britain economically through his Continental System.
The Continental System and Portugal’s Resistance
The Continental System, established by Napoleon in 1806, was a trade embargo designed to weaken Britain by barring its goods from European markets. While most of continental Europe complied, Portugal resisted full implementation of the system.
Prince Regent Dom João VI, ruling on behalf of his incapacitated mother, Queen Maria I, severed diplomatic ties with Britain and nominally closed Portuguese ports to British trade. However, he stopped short of confiscating British property or detaining British nationals, which Napoleon viewed as unacceptable defiance.
Prelude to the Invasion
Napoleon’s Ultimatum
By mid-1807, Napoleon’s frustration with Portugal reached its peak. On July 19, 1807, he issued an ultimatum demanding Portugal comply with his demands by September 1, including:
- Declaring war on Britain.
- Seizing British assets and goods in Portuguese ports.
- Arresting all British nationals in Portugal.
When Portugal failed to fully comply, Napoleon ordered preparations for an invasion.
The Treaty of Fontainebleau
On October 27, 1807, France and Spain signed the secret Treaty of Fontainebleau, formalizing their plans to partition Portugal into three regions:
- Northern Lusitania (Porto and surrounding areas) would become a new kingdom under Charles Louis of Etruria.
- The Algarve in southern Portugal would become a principality for Manuel de Godoy, Spain’s chief minister.
- Lisbon and central Portugal would fall under French control.
While ostensibly an agreement between allies, Napoleon’s true intentions were more self-serving. The treaty provided a pretext for moving French forces through Spain, laying the groundwork for Napoleon’s eventual interference in Spanish affairs.
The Invasion
French Forces and Command
Napoleon appointed General Jean-Andoche Junot to lead the invasion. Junot commanded the Gironde Army of Observation, comprising approximately 25,000 French soldiers, supported by 25,500 Spanish troops divided into three columns:
- General Taranco’s column advanced from Vigo to seize Porto.
- General Solano’s column moved from Badajoz to capture Elvas.
- General Carrafa’s column, stationed near Salamanca, was tasked with cooperating with Junot’s main force.
Led by General Jean-Andoche Junot, the Franco-Spanish troops faced little resistance due to Portugal’s weakened military. Image: A portrait of Junot. Artwork by Vincent-Nicolas Raverat.
Initial Movements
In mid-October 1807, Junot’s forces crossed the Spanish border at Alcántara and began their march toward Lisbon. However, logistical challenges quickly emerged. The poor condition of roads, harsh weather, and insufficient supplies caused significant delays:
- Half of the cavalry horses died during the march.
- Artillery was abandoned due to impassable terrain.
- Desertion and straggling reduced Junot’s effective force.
Despite these setbacks, Junot’s vanguard reached Lisbon on November 30, 1807, encountering no resistance. By this time, Prince Regent Dom João VI and the Portuguese royal court had fled to Brazil aboard a fleet organized with British assistance.
French Occupation of Portugal
Initial Occupation
Junot entered Lisbon without opposition, but his army was in a dire state. Many soldiers were stragglers, the cavalry was nearly destroyed, and artillery was minimal. Nevertheless, Junot swiftly consolidated French control over Lisbon and disbanded the Portuguese Army, incorporating some units into French service and sending others to garrison distant territories in Europe.
Economic Exploitation
To sustain his occupation force, Junot imposed heavy financial burdens on Portugal:
- A 100-million-franc indemnity was levied.
- Properties of individuals who fled to Brazil were confiscated.
These measures caused widespread resentment among the population, particularly as much of Portugal’s wealth had already been evacuated by the fleeing royal court.
Image: A monument honoring the heroes of the Peninsular War in Lisbon.
Public Unrest
The imposition of French authority sparked riots in Lisbon, particularly after the French flag was raised over public buildings in December 1807. Junot responded with force, deploying mounted troops to suppress demonstrations.
Resistance and the Peninsular Revolt
Uprisings in Spain and Portugal
In May 1808, the Dos de Mayo Uprising in Spain inspired widespread resistance across the Iberian Peninsula. Spanish troops stationed in northern Portugal, under General Belesta, turned against the French, seizing French officers and marching to join anti-French forces in Spain. By June 1808, revolts spread across northern Portugal, particularly in Porto and its surrounding regions.
Impact on French Control
The uprisings disrupted French supply lines and communications, weakening Junot’s hold on Portugal. Isolated and unable to receive reinforcements from Spain, Junot’s position became increasingly precarious.
British Intervention
Recognizing the strategic importance of Portugal and the opportunity to weaken Napoleon, Britain intervened directly. In August 1808, a British expeditionary force under Sir Arthur Wellesley (later Duke of Wellington) landed at Mondego Bay with 16,000 troops, marking the beginning of Britain’s military involvement in the Peninsular War.
Key Battles
- Battle of Roliça (August 17, 1808):
British forces achieved their first victory over the French near Óbidos, inflicting heavy casualties and forcing a French retreat. - Battle of Vimeiro (August 21, 1808):
Wellesley decisively defeated Junot’s forces, compelling the French to retreat toward Lisbon. Surrounded and outmaneuvered, Junot agreed to the Convention of Sintra, which allowed French troops to evacuate Portugal in exchange for safe passage to France.
Aftermath and Consequences
Impact on Portugal
The Prince Regent’s relocation to Brazil permanently altered the dynamics of the Portuguese Empire. Brazil’s importance grew, leading to its elevation as a kingdom in 1815 and eventual independence in 1822.
The Portuguese uprisings demonstrated the resilience of the population and strengthened their alliance with Britain.
The war exposed the weaknesses of Portugal’s military, prompting significant reforms in the following years.
Impact on the Peninsular War
Portugal became a key theater for Allied operations against Napoleon. The French failure in Portugal forced Napoleon to commit vast resources to a protracted and costly campaign in the Iberian Peninsula, ultimately contributing to his decline.
Significance of the Invasion
The invasion of Portugal in 1807 was a critical turning point in the Napoleonic Wars. It exposed the vulnerabilities of Napoleon’s strategy and galvanized resistance across the Iberian Peninsula.
While initially successful in occupying Portugal, the campaign ultimately failed due to logistical challenges, widespread uprisings, and British intervention. The events in Portugal marked the beginning of Napoleon’s struggles in the Peninsular War, which drained French resources and undermined his dominance in Europe.
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Frequently Asked Questions
Why did Napoleon decide to invade Portugal?
Portugal’s close ties to Britain, including trade with its colony in Brazil and allowing British naval use of Lisbon’s port, violated Napoleon’s Continental System aimed at isolating Britain economically.
Who was ruling Portugal at the time of the invasion?
Prince Regent Dom João VI, acting on behalf of his mentally incapacitated mother, Queen Maria I, was the ruler of Portugal.
What was the Treaty of Fontainebleau?
Signed on October 27, 1807, it was a secret agreement between France and Spain to partition Portugal into three regions: Northern Lusitania, the Algarve as a principality for Manuel de Godoy, and Lisbon under French administration.
Who led the French forces during the invasion?
General Jean-Andoche Junot commanded the French invasion force, known as the Gironde Army of Observation.
What challenges did the French army face during the invasion?
The army faced treacherous roads, harsh weather, and logistical difficulties, losing half of its cavalry horses and leaving behind artillery. Stragglers reduced Junot’s effective fighting strength.
What happened when the French reached Lisbon?
On November 30, 1807, the French entered Lisbon without resistance as the Prince Regent and his court had fled to Brazil, taking state treasures with them.
How did the French occupation affect Portugal?
Junot disbanded the Portuguese Army, imposed a 100-million-franc indemnity, and seized property, causing widespread public resentment and riots.
What was the Peninsular Revolt?
The Dos de Mayo Uprising in Spain in May 1808 inspired resistance across the Iberian Peninsula, including uprisings in northern Portugal that disrupted French control.
How did Britain respond to the unrest in Portugal?
Britain deployed 16,000 troops under Sir Arthur Wellesley (later Duke of Wellington) to support Portuguese resistance, marking the start of Britain’s direct involvement in the Peninsular War.
What were the key battles of British intervention in Portugal?
- Battle of Roliça (August 17, 1808): British forces achieved their first victory over the French near Óbidos.
- Battle of Vimeiro (August 21, 1808): Wellesley’s decisive victory forced Junot to surrender and led to the French evacuation under the Convention of Sintra.
What were the broader consequences of the invasion?
- For Portugal: The royal court’s flight to Brazil altered the empire’s dynamics, leading to Brazil’s rise as a kingdom and eventual independence.
- For the Peninsular War: Portugal became a key theater for Allied operations, and the French failure undermined Napoleon’s control over the Iberian Peninsula.
The Franco-Spanish invasion of Portugal in 1807 was not only a strategic failure for Napoleon but also a catalyst for broader resistance against French domination in Europe. Image: An 1812 painting of Napoleon in his study.
