Finnish invasion of the Karelian Isthmus

The Finnish victory at Hiitola forced the Soviet 142nd Rifle and 198th Motorized Divisions to withdraw into the Kilpola islands, where they were surrounded into a motti against the shore of Lake Ladoga.

[6] The main objective for the Finnish IV Corps was the city of Viipuri, and the plan called for surrounding and quickly capturing the town.

However, the Finnish General HQ did not allow IV Corps to start actively pursuing the Soviets until 21 August.

However the crossing of the Vuoksi by the Finnish 18th Division of the II Corps was assisted by the Finnish 12th Division and the Light Brigade T (which was named after its commander, Colonel Tiiainen, and consisted of the 1st Jaeger Battalion, two light detachments and two artillery companies) of the IV Corps which managed to punch through the Soviet lines.

[9] The Finns had cut all the roads to the motti, but they were unable to form a tight blockade in the thick forests, which allowed the majority of the men of the Soviet 115th and 123rd Rifle Divisions to escape towards Koivisto.

The Finnish forces reached the old border on 31 August and in early September the Soviet fortifications, where the Finns stopped their advance.

[10] On 20 August, General W. Erfurth notified Mannerheim that Field Marshal Wilhelm Keitel would send a letter describing where Finns would be asked to attack Leningrad.

Mannerheim explained the practical difficulties of the proposal and presented the opposition of both the political and military leadership to this attack.

The government had decided beforehand that Finland would not attack Leningrad, and it was only after pressure from the military leadership that they accepted a small advance across the old border to capture better defensive positions.

On 31 August Mannerheim gave the order that the attack be stopped at the line from the mouth of the river Rajajoki to Ohta.

In this last phase, the Soviets had six infantry divisions and a number of separate battalions and regiments defending Leningrad from the north, but all of them were at half strength due to the hard fighting with the Finns.

The commander of I Corps, Colonel Mäkinen, ordered his troops to advance to the line Ohta-Lake Lempaalanjärvi-Old border at Lake Ladoga with an addition, that if strong defences were met, the offensive could be stopped there.

The Soviet military leadership quickly learned of lessened Finnish pressure, and already on 5 September two divisions were transferred from the Karelian Isthmus to the south of the city, against the Germans.

Map depicting the Finnish offensive operations in Karelia carried out in the Summer and Autumn of 1941 during the Continuation War. The furthest advance of Finnish units in the Continuation War and borders for both before and after the Winter War are shown.