March 12, 1940 Winter War ended. Finland was fain to yield a big part of it's territory in south Karelia and Hanko peninsula also. It was rented by USSR for naval base.
Planning of the fortifications begun March 29, 1940. It was decided to construct defence line close to the border of the rented area of Hanko Cape. Harparskog Line should cover the Hanko peninsula neck and coastal line from Sommarö to Bredvick.
December 4, 1941 Soviet naval base was evacuated and Hanko siege ended.
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