Finnish conquest of East Karelia (1941)

Finnish soldiers in Olonets

The Finnish conquest of East Karelia (1941) refers to a military campaign carried out by Finland in 1941. It was part of what is commonly referred to as the Continuation War. Finnish troops occupied Soviet East Karelia and held it until their retreat in 1944.


For over a month after the outbreak of the Continuation war, the Karelian Army had stayed in place, replenished its forces and prepared for the continuation of its offensive while the Finns had recaptured the Karelian Isthmus. Also the Soviets had prepared new fortifications and brought new troops to the front. When encirclements on the western shore of Lake Ladoga were resolved, the Finnish 7.D was transferred to the junction of VI and VII Corps where it could assist both of them.

Advance to the Svir

Battle of Tuloksa

The Finnish offensive started on the early hours of September 4 at Tuloksa, when the largest artillery barrage so far in Finnish history was unleashed. This artillery barrage, its effectiveness, leading practices and ammunition usage was carefully inspected right after the battle, and prompted numerous improvements which were honed to perfection in the Battle of Tali-Ihantala. Closely following the barrage, the 5.D crossed the River Tuloksa 7 km from the mouth of the river at 5am. The river crossing was easy, but soon the Soviet defence strengthened. The Finnish armored battalion followed the spearhead and helped to destroy enemy strongpoints, and finally the coastal road was severed at 11am. The Soviet counterattack started at 1pm, and managed to encircle the Finns who had advanced to the coastal road. At 2pm when situation seemed dangerous to Finns, Col. Karhu committed the reserve division, the light detachment 4 to the battle, and together with tanks they managed to break the encirclement at 17:30, and in the ensuing battle scattered the defending forces and reached the coast of Lake Ladoga, thus cutting the retreat route of the forces still between them and River Tuloksa. During the night the encircled forces were destroyed. In the battle Soviet 3. Marine Br., IR452 and IR419 were shattered and partially destroyed; the road to Olonets was open.

Reaching the Svir

As soon as the breakthrough was secured, Detachment Lagus rushed through the 5.D towards Olonets which it captured on September 5 with only a short firefight. From there it advanced through the night towards the River Svir which the first units reached at 5am on September 7. The Marttinen Detachment was separated from the Lagus Detachment and armored battalion, and it advanced east from Olonets and captured the northern end of the railroad bridge over the Svir and severed the western branch of the Murmansk railroad on the morning of September 8.

On the left side of 5.D, the 17.D was not so successful, but the Soviet 3.D was able to hold its positions at Syandeba. Further north the 17.D fared better and its IR13 reached the Olonets-Petrozavodsk road on the evening of September 5, where IR 34 continued its advance southward along the road. IR44, which was part of the Lagus detachment, started advancing northwards from Olonets on September 6 along the road towards Nurmolitsy, which was captured the next morning. This meant that all road connections were severed from Soviet 3.D and it quickly broke away from Syandeba and tried to recapture Nurmolitsy unsuccessfully. During the September 7 Finns managed to capture the whole road between Nurmolitsy and IR34, but by abandoning their vehicles most of the Soviet 3.D managed to break through the Finnish lines on September 8 and cross the road eastward, thus escaping to the roadless forests there.

The 17.D marched to the Svir and started to clear both banks eastward from the railway bridge where the Murmansk railroad crosses the Svir. The Soviets had reinforced the area with the new 314.D, and the Finnish advance was slow, and by September 22, the Finns had consolidated a 5–10 km deep and 40 km wide bridgehead on the southern bank of the River Svir.

Advance towards Petrozavodsk

Attacks from the Olonets

On the northern side of the 7.D, the 1.D and 11.D were preparing to attack along the Olonets-Petrozavodsk road. Consequently, it had already started to capture bridgeheads across the River Säpsänjoki on August 31. Also here the Soviets had prepared defences along the roads, so the Finns decided to advance through the trackless forests to encircle the defending Soviet forces. On September 7 it managed to cut the Olonets-Petrozavodsk road north of the Pryazha roadcrossing, which was captured the following day. This resulted in the Soviet 272.D, IR9 and IR24 being cut off from their supply lines. The 1.D had attacked these forces and on September 7 it reached the main road.

The Soviets started a counterattack to open the road to Petrozavodsk from both sides against the roadblock at Pryazha, September 11–13, but they failed to open the road. This meant that the Soviet forces had no other option than to abandon their heavy equipment and retreat through the forests eastward, which they did during the next three days. After the area was cleared of Soviet forces, the 11.D continued the attack on September 20 by advancing along the main road and cutting it every two kilometers thus forcing the defenders to abandon their positions. Advancing this way the 11.D reached the village of Polovina on September 24, 20 km from Petrozavodsk.

Attacks from the Svir

Meanwhile, Col. Lagus had gathered his forces at the railroad bridge over the (river) Svir. On September 18 he resumed his offensive by attacking eastwards along the river to the village of Ostretsina, where he turned northwards to Ladva village. Between the 15–20 September the 7.D had built over 30 km of road through the swamps and marshy forests towards the Ladva station on the Murmansk railroad. The intention of these maneuvers was to encircle (in a double envelopement) the Soviet defenders (the 3.D and separate battalions) who had prepared defences along the railroad and who were supported by an armored train, impenetrable by Finnish AT weapons. The Finnish attack achieved surprise and the railroad was severed and the village of Ladva was captured on September 21. The encircled Soviet forces started an immediate retreat northwards along the railroad, and with the help of the armored train they managed to break the encirclement and retreat northwards on September 22.

Lagus didn't wait for the end of the battles at Ladva station, but ordered two battalions (led by Lt. Col. Björkman) to attack northwards from Ladva village and on September 24 they reached the shores of Lake Onega at the village of Derevjannoje, thus severing the last land connection south of Petrozavodsk.

On September 25 Lagus ordered Björkman to cut the railroad again near Petrozavodsk, and on September 27 he cut the railroad at Orsega. At the next day, Björkman was only 4 km from Petrozavodsk, when the attack was stopped as the forces were needed in Orsega, where Soviets were trying to break their encirclement. On September 29 Soviets managed to force their way through Finnish frontline at Orsega, and managed to advance still 5 km northwards before the Finns stopped them. The 7.D was following on the heels of the Soviet forces and on September 30 fierce fighting started at Orsega. The IR9 of the 7.D attacked southwards along the coastal road of the Onega, and at reached the Svir on October 2. The planned immediate crossing had to be postponed as tired troop refused to cross the river in the darkness of the night. The crossing succeeded on October 6 at 14:00, and during the following week the 7.D created 10 km deep bridgehead to the southern bank of Svir, until the arrival of Soviet 114.D halted Finnish advance and all troops started to prepare defensive positions.

Capture of Petrozavodsk

On September 26 the 11.D and the 1.D had continued their attack towards Petrozavodsk. The Soviet forces recognized the threatening situation and started to evacuate forces from Petrozavodsk, so when the 11.D cut the main road and railroad northwards from Petrozavodsk on September 30, most of the Soviet forces had already left the town. The last defenders of the town were evacuated over the Onega and Finns captured the town at the morning of October 1.

The Soviet 3.D realized that the road northwards was blocked, and after destroying its heavy equipment, including the armored train, it retreated to the roadless forest and started a long retreat southwards. The Finnish IR 30 started the pursuit, and after two weeks the remaining few hundred men of the 3.D managed to escape over the River Svir.

At the left side of the 11.D the 4.D advanced along the Sortavala-Petrozavodsk railroad. The direction was heavily fortified before the Winter War, and advancement was much slower so 4.D was still 12 km from Petrozavodsk when the town fell to the Finns. At the further north there was group Oinonen with 2.JBr and Cav. Br. with an orders to advance northeast. There were two roads with the wide roadless forest between which group Oinonen had to use, so Soviet 71.D decided to concentrate their forces against one of these, so they were able to force 2.JBr. in a counterattack of September 16–21 almost 10 km backwards before they were forced to retreat as the attack of the cavalry brigade threatened them with an encirclement. Group Oinonen continued pressuring the Soviet 71.D, and reached Lake Vatselänjärvi on September 29, thus opening the road eastward.

Advance towards Masel'skaya

Advance north from Petrozavodsk

After the capture of Petrozavodsk, the Karelian Army was ordered to continue its offensive northward along the railroad and capture the string of lake isthmuses up to the River Suna. The 1.D crossed the Bay of Petrozavodsk to Cape Gromovskoje October 2 and had cleared the southern part of the cape on October 7. The first isthmus was breached by 4.D on October 5, but the advance was slow because of delaying Soviet IR 1072. So the 1.D took responsibility of the attack and attacking IR5 was transferred from 4.D to 1.D. Also a new IR29 was sent from Petrozavodsk to help the 1.D, and finally on October 18 the River Suna was reached. The 4.D continued attack northward on the western side of the lakes, leaving only small detachments to secure next two isthmuses until it reached group Oinonen which had advanced eastward to the isthmus between Lake Sunjärvi and Lake Pyalozero on October 13. The attack continued northward along the western bank of Lake Pyalozero, and on October 19 the 4.D captured Justozero roadcrossing, opening the road towards Medvezhyegorsk right before Soviet IR126 managed to pass the crossing, forcing it to abandon its heavy equipment and retreat north through the woods.

Attacks from Porosozero

Finns take Porosozero

The 8.D had been transported from Karelian Isthmus to Porosozero, which had been captured by Brigade Kuusjärvi on October 12 when Soviet forces started to retreat from their prepared positions in threat of the advance of the 4.D towards Justozero. on October 15 the 8.D, strengthened with Brigade Kuussaari, started the attack across the River Suna and on October 18 captured the roadcrossing at Lake Jangozero, from where it continued towards Justozero, where 4.D was contacted on October 20, and towards Lake Segozero, which was reached on October 19. The 8.D continued cleaning the southern shore of the Lake Segozero, and captured the village of Masel'skaya at November 1 before it has to stop when it faced a new Soviet 289.D. The attack started again after three weeks preparations at November 21, and managed to press defenders against the shores of the lake, but those managed to retreat over the frozen lake at November 28. Also the capture of the Masel'skaya railway station failed, as a new Soviet 263.D reached the station right before the Finns. As it became evident that offensive couldn't be continued to the target (the railway station), the 8.D was ordered to prepare defensive positions.

The capture of Justozero threatened the long right flank of Soviet forces defending the eastern bank of the River Suna. So 4.D reinforced with IR45 was ordered to advance to the shores of the Onega and isolate Soviet forces there. The attack started on October 20, and October 24 it captured the village of Myandusel'ga at the southern end of the Lake Semchezero, but failed to advance from there. IR26 was ordered to encircle the enemy by going around the lake, and in the early morning of October 27 it managed to capture the village of Kumsa, thus severing the Soviet connection behind and forcing them to retreat. Meanwhile, the IR45 had advanced through forest paths and improved them so that motorized vehicles could use the route, and reached the railroad near Kyappasel'ga station on October 27. During the next two days, they managed to capture the station and an armored train which became stuck at station.

Capture of Kondopoga

At the same time, October 27, the main offensive across the River Suna started, and the Cavalry Brigade managed to secure a bridgehead. On the next day, also the 2.JBr. crossed the river and started advancing towards Kondopoga, while the Cavalry Brigade turned northwards to race around the Lake Sandal. In the following day also the 1.D crossed the river and together with the 2.JBr. they started attacking Kondopoga, but the first assault on the move failed and Finns stopped for preparations. The Soviet 313.D, which defended Kondopoga, had noticed that additional Finnish units threatened its connections northward, so it started withdrawing from Kondopoga at the evening of November 2, just before the planned Finnish offensive of the next morning. Finns captured the burned down town before midnight and continued pursuing retreating Soviets, but although the Cavalry Brigade had severed the railroad and main road northwards, the Soviet division managed to retreat using the hastily built road between the main road and the shores of the lake.

The situation although improved for the defenders, as the length of the front shortened and it was anchored on the both ends to the lakes. The reinforcements had improved the force ratio: There were three Finnish divisions and two brigades against four Soviet divisions and a brigade. Also the high hills south and west of town Medvezhyegorsk provided natural defensive positions which were improved by extensive field fortifications, where Finnish advance stopped November 8.

Reaching Medvezhyegorsk and Povenets

During the next two weeks Finns prepped the defences, and at November 21 1.D started an attack which managed to drive 5 km deep wedge to the Soviet defences before being stopped. At the northern side of Medvezhyegorsk, the 4.D had to stop only 4 km from the center of the town at November 19. The renewed offensive started at November 29, which managed to breach the outer defences west of the town by December 2. Meanwhile, Mj. Gen. Lagus' 1.JBr. reached the front and joined the offensive at December 4. At the next morning the 4.D from north and the 1.JBr. from west breached the Soviet lines and advanced to the town. The 2.JBr. followed right behind Lagus' men and started clearing the town when 1.JBr. continued quickly eastward towards Povenets, which they reached next day, thus closing the White Sea Canal. Small units crossed the canal and advanced few kilometers before returning to Povenets, where they were ordered to form defensive positions. At the night of December 8 Soviet pioneers blew up the locks of the canal, and the following flood breached the protecting banks of Povenets thus drowning a few men.

Attack towards Rugozero

Encirclement Battle of Omelia

North of the Karelian Army, the Finnish 14. Infantry Division (Col. Erkki Raappana) was ordered to advance to Rugozero. The area was defended by Soviet IR337 (of 54.ID) and 73.Border Guard Detachment, and also here the defenders had prepared 15–20 km deep area with field fortifications.

First patrols crossed the border July 1, and general advance started July 3. Defenders managed to delay Finnish advance, and it was July 8, when Finns captured Reboly. The advance continued July 11, when Finns crossed Lake Leksozero, and started to encircle Soviet forces defending narrow isthmuses. The encirclement was completed July 21, and as a Soviet attempt to open the road eastward was repulsed July 23, they started to evacuate personnel over the Lake Rovkulskoye. The evacuation wasn't fully successful, as over 100 men drowned and 300 were captured, when the motti of Omelia finally surrendered on July 24.

Capture of Rugozero

Because the Finns had no light units available, they advanced slowly eastward, and the next battles were fought between July 30 and August 12 for the control of Ontrosenvaara hills where the Soviet 54.D had brought reinforcements, including parts of IR137 and 71. Border Guard Detachment. When these forces were unable to stop the Finnish attack, the Soviet 7. Army ordered a new 27. ID to be formed in the area. It turned out that Soviets had carefully prepared positions at Rukavaara hill only a few kilometers eastward, and retreating forces manned these positions and managed to stop the Finnish advance for three weeks there. On September 3 the Finns attacked, encircling the hill and forcing the defenders to leave their positions on September 8. The village of Rugozero was captured September 11, and the River Onkajoki was crossed September 15. After advancing only 2 km Finns reached the Soviet positions which it couldn't capture on the move. Although the regimental target wasn't reached, the target Mannerheim had ordered was reached by capturing Rugozero and securing it, so 14.D was ordered to defensive.

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