- Peter the Great's Naval Fortress
Peter the Great's naval fortress or the Tallinn-Porkkala defence station was a Russian fortification line, which aimed to block access to the Russian capital
Saint Petersburgvia the sea. The plans for the fortress included heavy coastal artillerypieces along the northern and southern shores of the Gulf of Finland. The emphasis was put on the defences of the gulf's narrowest point, between Porkkala, (in current day Finland) and Tallinn, (in current day Estonia). This was a strategic point, as the two fortresses of Mäkiluotoand Naissaarwere only 36 kilometres apart. The coastal artillery had a range of about 25 kilometres and could thus "close" the gap between the shores, trapping enemy ships in a crossfire. Furthermore, a new major naval base was constructed in Tallinn.
The reason for the naval fortress
The decision to start construction the naval fortress line came after the disastrous events at Tsushima, where the whole Russian Baltic Fleet had been annihilated. The road to Saint Petersburg was now unprotected and open. The quickest and cheapest way of dealing with this problem was to protect Saint Petersburg with a seemingly impenetrable zone of coastal artillery until a new fleet had been constructed. The idea was presented for the first time in 1907. Czar Nicholas II approved the plans on
July 5, 1912and the construction began soon thereafter.
The system consisted of several zones of defence.
#The innermost zone consisted of the fortresses at
Kronstadtand the land and coastal fortresses near Vyborg. The latter were to prevent that the enemy circeled the Kronstadt line by landing near the Bay of Vyborg.
# The second line was between
Kotkaand Narva, following the between-laying islands.
# The third and main line of defence was between Tallinn and Porkkala.
# The fourth line was between
Hiiumaaand the Hanko Peninsula.
Further, Helsinki was encircled with defensive lines on land. This defensive line was called "Krepost Sveaborg"
The construction of the defensive system was slowed down due to the outbreak of
World War I. The naval fortress was only partly finished when both Finland and Estonia declared their independence, following the Russian October revolution. The German Navy performed one major landing operation on the shores of the Gulf of Finland during World War I. In April 1918, following a request from the Senate of Vaasain Finland, the German Ostsee Division, led by Rüdiger von der Goltzlanded in Hankoo, joined the Finnish "Whites" in the fight against the "Reds" and conquered Helsinki.
The heavy batteries of the Tallinn-Porkkala line
The heaviest batteries were supposed to consist of 356 mm/52 m 1913 guns. However, at the time of the
Russian revolution of 1917, these were still under construction and were not finished.
**4x 203 mm/50 V
**4x 305 mm/52 O
**4x 234 mm/50 Be
**4x 203 mm/50
**4x 152 mm/45 C
**3x 120 mm/50 V
**2x 305/52 O
**4x 120/50 V
**4x 234/50 Be
**3x 120/50 V
In the 1930s the Finnish and Estonian coastal defenses made extensive plans to use the fortresses against their former masters, and prevent the Soviet
Baltic Fleetfrom gaining access to the seas. The defense would be strengthened by minefields and patrolling submarines from the Finnish and Estonian navies. These plans were however nullified with the Soviet demands of air and naval bases in the Baltic States in 1939.
The fortress in Porkkala, along with its 305 mm guns was leased to the Soviet Union in the
Moscow Armisticeof 1944. When the territory was returned to Finland in 1956, the guns were demolished.
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