A cannon battery in Ruissalo
Russian battery during Crimean War
There are five batteries for defence in Ruissalo from the era of the Crimean War (1854–1856). The largest batteries are located next to patch 68 and close to Villa Carlo next to patch 41. Cannon batteries have been located also nearby patches 56 and 61 and near Honkapirtti. In addition, a battery for defence from the era of the Finnish War (1808–1809) can be found in the area of patch 95.