Unlike its many coalition partners, Britain remained at war throughout the period of the Napoleonic Wars. Protected by naval supremacy (in the words of Admiral Jervis to the House of Lords "I do not say, my Lords, that the French will not come. I say only they will not come by sea"), the United Kingdom maintained low-intensity land warfare on a global scale for over a decade. The British Army provided long-term support to the Spanish rebellion in the Peninsular War of 1808–1814, assisted by Spanish guerilla ('little war') tactics. Anglo-Portuguese forces under Arthur Wellesley campaigned successfully against the French armies, eventually driving them from Spain and invading southern France. By 1815, the British Army would play the central role in the final defeat of Napoleon at Waterloo.