provided long-term support to the Spanish rebellion in the Peninsular War of 1808–1814, assisted by Spanish guerrilla ('little war') tactics. Anglo-Portuguese forces under Arthur Wellesley supported the Spanish, which campaigned successfully against the French armies, eventually driving them from Spain and allowing Britain to invade southern France. By 1815, the British Army played the central role in the final defeat of Napoleon at Waterloo. Beyond minor naval actions against British imperial interests, the Napoleonic Wars were much less global in scope than preceding conflicts such as the Seven Years' War, which historians term a "world war". Economic warfare In response to the naval blockade of the French coasts enacted by the British government on 16 May 1806, Napoleon issued the Berlin Decree on 21 November 1806, which brought into effect the Continental System. This policy aimed to eliminate the threat from Britain by closing French-controlled territory to its trade. Britain maintained a standing army of 220,000 at the height of the Napoleonic Wars, of whom less than half were available for campaigning. The rest were necessary for garrisoning Ireland and the colonies and providing security for Britain. France's strength peaked at around 2,500,000 full-time and part-time soldiers including several hundred thousand National Guardsmen whom Napoleon could draft into the military if necessary. Both nations enlisted large numbers of sedentary militia who were unsuited for campaigning and were mostly employed to release regular forces for active duty. The Royal Navy disrupted France's extra-continental trade by seizing and threatening French shipping and colonial possessions, but could do nothing about France's trade with the major continental economies and posed little threat to French territory in Europe. France's population and agricultural capacity far outstripped that of Britain. Britain had the greatest industrial capacity in Europe, and its mastery of the seas allowed it to build up considerable economic strength through trade. This ensured that France could never consolidate its control over Europe in peace. Many in the French government believed that cutting Britain off from the Continent would end its economic influence over Europe and isolate it. Financing the war A key element in British success was its ability to mobilise the nation's industrial and financial resources and apply them to defeating France. Although the UK had a population of approximately 16 million against France's 30 million, the French numerical advantage was offset by British subsidies that paid for many of the Austrian and