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Battle of Petsamo
Part of Winter War
Map of the operations in Petsamo in 1939 and 1940
Date November 30, 1939 to March 12, 1940 Location Petsamo, Finland Result Soviet victory
Combatants
Finland	Soviet Union
Commanders
Captain Antti Pennanen	Kirill Meretskov, Valerian Frolov.
Strength
Three companies	Two divisions

The Battle of Petsamo was fought between Finnish and Soviet troops in the area of Petsamo in the far north of Finland. The Finnish troops were greatly outnumbered but managed to contain the Soviet troops due to the extreme terrain and weather.

The Finnish troops consisted of the 10th Separate Company (10.Er.K) in Parkkina and the 5th Separate Battery (5.Er.Ptri) in Liinakhamari. The separate companies and batteries didn't belong to any specific division of the Finnish Army and could be placed in ad hoc formations. The troops were part of the Lapland Group (Lapin Ryhmä) of the Finnish Army which had its headquarters at Rovaniemi. The troops were later reinforced with the 11th Separate Company and a 3rd Company which wasn't part of the original mobilization plans. Also the small Reconnaissance Group 11 (Tiedusteluosasto 11) was added to the troops. All the troops were called Detachment Pennanen (Osasto Pennanen) after their commander captain Antti Pennanen.

The Soviet Union had the 14th Army in the Kola peninsula. The army consisted of three divisions, the 104th, 52nd and the 14th. Only the 104th and 52nd Divisions took part in the operations in Petsamo. The Soviets had an overwhelming superiority in troops in the area.

Elements of the 104th Division crossed the border on November 30, 1939 and occupied the Finnish part of the Rybachi peninsula. The 242nd Infantry Regiment of the 104th Division reached Parkkina on December 1. The Finnish troops withdrew to Luostari. The 52nd Division was moved to Petsamo by boat. The 52nd took over the attack from the 104th and pushed back Detachment Pennanen all the way to Höyhenjärvi until the attack was halted on 18 December. During the following two months the Soviet forces stood still. During this time the Finnish troops made several reconnaissance and guerilla raids behind enemy lines. After the two month pause the Soviet advance continued and this time attacks on 25 February forced the Finnish troops to Nautsi near Lake Inari. Here the troops stayed until the end of the war.

In the Moscow Peace Treaty Finland was forced to cede parts of her territory to the Soviet Union. Among these areas was Finnish part of the Rybachi peninsula (Kalastajasaarento) in the extreme north of Petsamo. The Soviet Union would take the whole Petsamo area after the Continuation War.

• Operation Platinfuchs