 Ramba uchinyora ndima iyi - Kutonga kwake kwakanga kusina kunaka uye kwaizoguma kamwe kamwe. Muna 1805, akabatana neThird Coalition yairwisana naNapoleon. Hondo yake yakaenda zvakashata uye vaFrench vakatora Swedish Pomerania. Apo mubatanidzwa wake, Russia, akaita rugare ndokupedzisa mubatanidzwa neFrance paTilsit muna 1807, Sweden nePortugal dzakasara seshamwari dzeEurope dzeGreat Britain. Musi waFebruary 21, 1808, Russia yakapinda muFinland, iyo yaitongwa neSweden, nechikonzero chokumanikidza Sweden kubatana neNapoleons Continental System. Denmark nenzira yakafanana yakazivisa hondo kuSweden. Mumwedzi mishomanana chete pashure pacho, Finland yose zvayo yakarasikirwa kuRussia. Somugumisiro wehondo yacho, musi wa17 September 1809, muChibvumirano cheHamina, Sweden yakapa chikamu chimwe muzvitatu chokumabvazuva kweSweden kuRussia. Hurumende yokuzvitonga yeGrand Principality of Finland mukati meRussia Imperial yakatangwa. 