The Peninsular War was a military conflict between France and the allied powers of Spain, the United Kingdom, and Portugal for control of the Iberian Peninsula during the Napoleonic Wars. The war began when French and Spanish armies crossed Spain and invaded Portugal in 1807. Then, in 1808, France turned on its ally, Spain. The war lasted until the Sixth Coalition defeated Napoleon in 1814. The conflict is regarded by some historians as one of the first national wars and is also significant for the emergence of large scale guerrilla warfare . The French occupation destroyed the Spanish... administration, which fragmented into quarrelling provincial juntas. In 1810, a reconstituted national government fortified itself in Cádiz and proved unable to recruit, train, or equip effective armies due to being under siege. British and Portuguese forces secured Portugal, using it as a secure position from which to launch campaigns against the French army while Spanish guerrilleros bled the occupiers.
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| Occurred: |
May 2, 1808 - April 17, 1814
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| Location: | Iberian Peninsula |