In return, the corps was reinforced with a formation called Group O (Finnish: Ryhmä O) which consisted of three brigades.

With multiple corps planned to attack in three different directions, the operation was too complicated to be left uncoordinated by a higher echelon.

[7][9][8] During this reorganization, VII Corps was moved to the southern flank of the Army of Karelia into a region spanning from the line Onkamo-Vyartsilya in the north to Pyhäjärvi in the south.

[11] Concurrently, other forces of the Army of Karelia would attack to the north of Lake Yanisyarvi before turning south.

[14][15] The initial attack of the 7th Division advanced slowly on a narrow front, causing significant Finnish casualties.

[18] The Soviet forces in the region were cut off when II Corps reached Lahdenpohja to the east on 7 August.

[20][21][19] Consisting of the 7th, 19th and 2nd divisions,[20] I Corps was to destroy the Soviet forces encircled in the area of Sortavala and then organize coastal defenses.

[34] On 6 November, Finnish forces in the region were ordered to advance north towards the northernmost point of Lake Onega, which would be used to anchor an east-facing defensive line.

For this attack, the forces on the northern flank of the Army of Karelia were reorganized as II Corps, which consisted of the 4th and 8th divisions, Group O and Brigade K.[35] Finnish active operations ceased in early December, after the Finnish forces had secured the isthmus between Medvezhyegorsk and Lake Segozero.

[36] During the ensuing trench warfare period, VII Corps remained in Petrozavodsk, where it was responsible for coastal defence.