Rubuta ci gaba ga wannan sakin layi - Isotalo yana kan hutun rashin lafiya kuma ba zai iya shiga cikin balaguron ƙabilar farko a lokacin rani na 1918 saboda raunin da ya samu a yakin basasa. Ya yi murabus daga rundunar a watan Nuwambar 1918 kuma ya tattara masu sa kai don Yakin Estonia na Independence a farkon 1919. A wannan shekarar, ya shiga ƙungiyar masu sa kai na Finnish a cikin tafiyar Aunus
, mafi girman balaguro na yaƙe-yaƙe na kabilanci, inda ya jagoranci kamfaninsa zuwa nasarori da wuri kuma ya taka muhimmiyar rawa wajen cin nasarar Olonets (Aunuksenkaupunki). Ayyukansa a wannan lokacin sun yi wahayi zuwa ga sanannen waƙa (Kuularuiskulaulu), amma nasarorin nasa ba su da tasiri na dogon lokaci yayin da tafiyar ta ƙare da shan kashi, a wani ɓangare saboda rashin tallafi daga gwamnatin Finland.