<P> In 1808 French forces invaded Portugal trying to attempt to halt trade with the United Kingdom, turning Spain into a satellite state in the process . The British responded by dispatching a force under Sir Arthur Wellesley which captured Lisbon . Napoleon dispatched increasing forces into the Iberian Peninsula, which became the key battleground between the two nations . Allied with Spanish and Portuguese forces, the British inflicted a number of defeats on the French, confronted with a new kind of warfare called "guerrilla" which led Napoleon to brand it the "Spanish Ulcer". </P> <P> In 1812, Napoleon's invasion of Russia caused a new coalition to form against him, in what became the War of the Sixth Coalition.In 1813, British forces defeated French forces in Spain and caused them to retreat into France . Allied to an increasingly resurgent European coalition, the British invaded southern France in October 1813, forcing Napoleon to abdicate and go into exile on Elba in 1814 . </P> <P> After escaping and briefly threatening to restore the French Empire, Napoleon was defeated by combined British, Prussian and Dutch forces at Battle of Waterloo in June 1815 . With strong British support, the Bourbon monarchy was restored and Louis XVIII was crowned King of France . The Napoleonic era was the last occasion on which Britain and France went to war with each other, but by no means marked the end of the rivalry between the two nations . Despite his final defeat, Napoleon continues to be regarded as a national hero figure in France for his numerous victories over coalised monarchies . </P> <P> Britain and France never went to war after 1815, although there were a few "war scares ." They were allied together against Russia in the Crimean War of the 1850s . </P>

When did england last go to war with france