At the Congress of Erfurt ( September – October 1808 ) Napoleon and Alexander agreed that Russia should force Sweden to join the Continental System , which led to the Finnish War of 1808 – 1809 ( meaning Sweden played no role in the next coalition against Napoleon ) and to the division of Sweden into two parts separated by the Gulf of Bothnia . The eastern part became the Russian Grand Duchy of Finland . Due to the Continental System , Britain was yet again still at war with Napoleon and was not affected by the peace treaty
Congress of Erfurt
Congress of Erfurt
War of the Fourth Coalition