The British Intervention in the Iberian Peninsula …

Years: 1804 - 1815

The British Intervention in the Iberian Peninsula (1808–1813)

As Napoleon's forces occupied Spain and Portugal, Britain saw an opportunity to support the Iberian resistancewhile striking a decisive blow against French expansion.

The British Expeditionary Force Arrives (1808–1809)

  • Initially, Britain had planned to send forces to Spanish America, but after the popular uprisings in Spain, the expedition was redirected to the Iberian Peninsula.
  • In 1808, British troops landed in Portugal, engaging in early battles against the French.
  • In 1809, a larger contingent, commanded by Arthur Wellesley (later Duke of Wellington), arrived to take command of the British war effort in Iberia.

The Spanish Resistance – Cadiz and the Guerrillas

Despite Napoleon’s early military successes, Spain did not fully fall under French control:

  • Cadiz, the last major Spanish city still in Spanish hands, remained under siege but never fell to the French.
  • Meanwhile, the Spanish countryside was controlled by guerrillas, who launched relentless raids and ambushes, forcing the French to keep 250,000 of Napoleon’s best troops under Marshal Nicolas Soultoccupied in counterinsurgency operations.

Wellington and the Path to Victory

With Napoleon’s forces tied down by guerrilla warfare, Wellington waited for the right moment to launch his major offensive campaign.

  • By 1812–1813, the British, Spanish, and Portuguese forces, strengthened by growing Spanish resistance, went on the offensive.
  • The campaign culminated in the Battle of Vitoria (June 21, 1813), where Wellington decisively defeated the French, forcing them into full retreat toward the Pyrenees.

Conclusion – The Turning Point in the Peninsular War

The British intervention, combined with Spanish guerrilla warfare and sustained resistance in Cadiz, played a pivotal role in breaking Napoleon’s hold on the Iberian Peninsula. The defeat at Vitoria in 1813 marked the beginning of the end for French rule in Spain, setting the stage for the final expulsion of Napoleonic forces in 1814.

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