By the beginning of the Soviet offensive in the Karelian Isthmus action intensified at the southern section. on February 11 in addition to the 8-th army here it was created 15th Army (commander of the 2nd rank MP Kovalev) numbering 117 thousand. man. She was ordered to attack along the northern shore of Lake Ladoga in the rear of the "Mannerheim Line". However, the 15 th Army in the second half of February 1940 Loymollovskaya operation (between settlement Loymolla and Lake Ladoga) ended in failure. Commander Kovalev intervened in the action of the individual compounds, up to battalions after failing at the same time to establish general guidance army. The troops were introduced into battle piecemeal, as they approach the front, without the accumulation of forces and the creation of strike force. As a result of the operation is reduced to fragmented action comes without a close relationship with each other divisions, who are victims of flank attacks Karelian group Talvela.