The question of Åland was to be a bone of contention in the relations between Finland and Sweden for a long time, which Mannerheim was not able to put aside either.This may have been a reason why, being faced with a difficult choice during the Second World War, he was prepared to consider offering Åland instead of some other area to the Soviet Union.
Tämä on saattanut olla eräs syy siihen, että hän toisen maailmansodan aikana oli vaikeassa valintatilanteessa valmis harkitsemaan Ahvenanmaan tarjoamista jonkin muun Neuvostoliiton vaatiman alueen tilalle.