The Third French Invasion of Portugal (1810–1811) …

Years: 1804 - 1815

The Third French Invasion of Portugal (1810–1811) – Masséna’s Defeat and Expulsion

After two failed French invasions, Napoleon ordered a third and final attempt to subdue Portugal in 1810, sending Marshal André Masséna, one of his most experienced commanders, at the head of a powerful army. However, Wellington’s defensive strategy and the Portuguese scorched earth tactics would once again doom the French campaign.

The French Advance into Portugal (1810)

  • Masséna's army entered Portugal via Guarda, pushing toward Viseu.
  • Finding Wellington's forces holding the main roads, Masséna led his army across the rugged Buçaco Mountains, attempting to outflank the Anglo-Portuguese army.
  • On September 27, 1810, at the Battle of Buçaco, Masséna launched a frontal assault, but Wellington’s forces held firm, inflicting heavy casualties.
  • Despite this setback, the French continued advancing, capturing Coimbra, which they sacked and plundered.

Wellington’s Strategic Withdrawal to Torres Vedras

Rather than risk a decisive battle in the open, Wellington executed a strategic withdrawal southward, drawing Masséna’s army into a trap.

  • Wellington withdrew behind the Lines of Torres Vedras, a massive network of defensive fortificationsprotecting Lisbon.
  • These defenses were carefully prepared in advance, creating an impenetrable barrier with fortified positions, artillery placements, and supply depots.

Masséna’s Stalemate at Torres Vedras

Upon reaching Torres Vedras, Masséna realized he could not breach Wellington’s defenses:

  • The fortifications were too strong for a direct assault.
  • The French army was cut off from its supply lines, running low on food and ammunition.
  • Portuguese guerrillas and militia harassed the French rear, further straining their supply situation.

After months of stalemate, Masséna was forced to withdraw, his army weakened and starving.

The French Retreat and Defeat at Sabugal (April 1811)

  • As the French army retreated northward, Wellington pursued aggressively, harassing the demoralized enemy.
  • At Sabugal (April 3, 1811), Wellington’s forces overtook Masséna, inflicting a decisive defeat.
  • Masséna was forced to retreat from Portugal entirely, ending the third and final French invasion.

Conclusion – The Final Failure of Napoleon’s Portugal Campaigns

The Third French Invasion of Portugal had ended in disaster, marking the final failure of Napoleon’s attempts to conquer the country:

  • Wellington’s strategic brilliance and the Lines of Torres Vedras proved insurmountable for the French.
  • Masséna’s inability to sustain his army in enemy territory mirrored Napoleon’s later failures in Russia (1812).
  • Portugal remained free of French control, ensuring that Britain maintained a crucial foothold in Iberia.

This campaign sealed the fate of the Peninsular War, as French forces were now on the defensive, and Wellington prepared to take the fight into Spain, leading to the liberation of Iberia in 1813–1814.

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