Paul, which was a secret project of a planned allied Russo-French expedition against the British possessions in India. In 1805 both countries again attempted to combine operations with British expeditions to North Germany and Southern Italy in concert with Russian expeditionary corps were intended to create diversions in favour of Austria. However several spectacular French victories in central Europe ended the Third Coalition. Following the heavy Russian defeat at Friedland, Russia was obliged to enter Napoleon's continental system, barring all trade with Britain. Subsequently, both countries entered into a state of limited war, the Anglo-Russian War (1807–12), although neither side actively persecuted operations against each other. In 1812 Britain and Russia once again became allies against Napoleon in the Napoleonic Wars. The United Kingdom gave financial and material support to Russia during the French invasion in 1812, following which both countries pledged to keep 150,000 men in the field until Napoleon had been totally defeated. They both played major cooperative roles at the Congress of Vienna in 1814–1815 establishing a twenty-year alliance to guarantee European peace. Eastern Question, Great Game, Russophobia From 1820 to 1907, geopolitical disputes led to a gradual deterioration in Anglo-Russian relations. Popular sentiment in Britain turned increasingly hostile to Russia, with a high degree of anxiety for the safety of British rule in India. The result was a long-standing rivalry in Central Asia. In addition, there was a growing concern that Russia would destabilise Eastern Europe by its attacks on the faltering Ottoman Empire. This fear was known as the Eastern Question. Russia was especially interested in getting a warm water port that would enable its navy. Getting access out of the Black Sea into the Mediterranean was a goal, which meant access through the Straits controlled by the Ottomans.<ref>C.W. Crawley, "Anglo-Russian Relations 1815-40. Cambridge Historical Journal 3.1 (1929) 47-73. in JSTOR</ref> Both intervened in the Greek War of Independence (1821–1829), eventually forcing the London peace treaty on the belligerents. The events heightened British Russophobia. In 1851 the Great Exhibition of the Works of Industry of All Nations held in London's Crystal Palace, including over 100,000 exhibits from forty nations. It was the world's first international exposition. Russia took the opportunity to dispel Russophobia in Britain by refuting stereotypes of Russia as a backward, militaristic repressive tyranny. Its sumptuous exhibits of luxury products and large 'objets d'art' with little in the way of advanced technology, however,