Thoughts from people besides Irsich and Icabod?
Sketch of what nappy needed to do:
1807 marked the famous treaty of Tilsit. At least, thought most obsevers, peace would be fought to Europe. A Franco-Russian alliance would ensure stability.
Indeed, in the warm glow afterwards, there was talk of partitioning the Ottoman Empire between the two of them; Napoleon had not yet given up his dreams of an eastern empire.
Moreover, Alexander was dismayed. He had been promised a lenient peace for Prussia, and found out that Napoleon had stripped the nation of half its territories, set up a Polish state, and threaten Russia’s western borders. While the Czar would recognize French hegemony in Western Europe, he could not tolerate French efforts to do likewise in Eastern Europe.
Equally damaging was the continental blockade. Russia, quite simply, could not be a part of it. Russia was dependent upon Britain for markets for its raw materials; the Grand Empire, at this point, could not act as a replacement. France could not buy these items, and could not sell what Russia needed; it is in this context that the Czar banned French luxury imports in 1810 [1].
Meanwhile, Napoleon had overreached himself elsewhere
Spain
Franco-Spanish relations had improved to the point where by 1808 they were allies, with over 100,000 French troops in Spain. This was generally accepted by most Spaniards, who viewed it as part of a plan for an invasion of Portugal.
Spain, for its part, was descending into chaos. Charles VI relied upon Manuel Godoy to support him, while Charles’s son, Ferdinand, opposed him. The two were opposed in a near deadly rivalry; and both asked Napoleon for help in October of 1807; indeed, Charles was right to appeal to Napoleon, for he was found dead in December. Ferdinand placed the blame on Godoy, and was appointed as the King of Spain.
Meanwhile, in Portugal, John VI had fled to Brazil with his tail between his legs; the French marshal Junot occupied Lisbon shortly thereafter. Junot took his regency seriously, and would eventually become King of Portugal under Napoleon. And while the British would consider sending a force, under Sir Admiral Wellington, it would eventually be rejected.
Wellington would be used in the south of Spain, as part of Napoleon’s master plan.
Napoleon’s plan, bluntly, involved taking Gibraltar, and then North Africa. From there, the French would occupy Constantinople, Egypt, Persia, and march to India. The glorious army would then effortlessly sweep away Britain’s holdings there, and there would be much rejoicing [2].
Britain, for its part, soon suffered severe economic problems. Widespread smuggling in Latin America helped to alleviate this, as did smuggling on the Continent [3]. The siege of Gibraltar, lasting until 1810, helped to prove Napoleon’s mastery of Europe. With the Austrians cowed, there was no option.
[1] Okay, he just put ridiculously high tariffs on them, to the same end.
[2] Or everyone dies enroute. Not one for half measures, the Emperor.
[3] I suspect that, because Britannia rules the waves, Britain would’ve managed to open up the Latin American markets, by force, if need be.