17 September 1941
Over 70 men from a penal Battalion (dubbed "Pärmi's Battalion") defect to the enemy side during fighting in Vuohtjärvi.
Northern Finland: Finnish-German attack towards Kantalahti halts at the heavily fortified Vermanjoki-line.
Finnish daily losses: 104
Wounded Swedish volunteer Sergeant-Major Kolthoff, who passed away later the same day. (Hanko)
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18 September 1941
17.Division captures the town of Podporoze.
Mannerheim visits Karelian Isthmus.
Radio Moscow announces that every male between age 16 and 50 must begin military training on October 1st.
Finnish daily losses: 71
Russian medical staff in Miehikkälä workcamp.