Following the Swedish defeat in the Finnish War in 1809, the region became a part of the Russian Empire, and the city of Helsinki was promoted to be the new capital of the new Grand Duchy of Finland.
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Part of the regiment was transferred to Sweden and was garrisoned in Gävle as F d finska artilleriregementet after the Finnish War in 1809.
The fortress was not quite ready by the time Finnish War began and the fortress lost its military value after the border between Russia and Sweden moved from Kymi River to Torne River.