 Nyorai kupfuurira kweiyi ndima - Mannerheim akaita basa muRussian Imperial Army, achikwira na1917 kusvika pachinzvimbo chalieutenant general. Aiva nenzvimbo yakakurumbira mumhemberero dzokupfekedzwa korona kwaCzar Nicholas II muna 1896 uye gare gare akava nemisangano yakawanda yomunhu oga naCzar. Pashure pechimurenga cheBolshevikMuna November 1917 muRussia, Finland yakazivisa rusununguko rwayo asi nokukurumidza yakabatanidzwa muhondo yevagari vemo pakati pevaBolshevik Vatsvuku ne Vachena, avo vaiva mauto eSeneti yeFinland, vachitsigirwa nemauto eUmambo hweGermany. Mannerheim akagadzwa kuva mukuru wemauto evaWhite, nedare reFinland. Mannerheim akagadzwa kuva Mutungamiriri Mukuru wemauto enyika muna 1939 mushure mekukundikana kweSoviet kupinda muFinland. Iyewo pachake muchirongwa Operation Barbarossa uye akatungamirira Finnish Defence Forces kupinda muUSSR pamwe Nazi Germany anozivikanwa sezvo Kuenderera Hondo. Muna 1944, apo tarisiro yekukundwa kweGermany muHondo Yenyika II yakava pachena, Paramende yeFinland yakasarudza Mannerheim semutungamiri weFinland, uye akatarisira kutaurirana kworugare neSoviet Union neUnited Kingdom. Akasiya chigaro choutungamiri muna 1946 uye akafa muna 1951. 