The Mannerheim Line is penetrated at Lähde
The Soviet main assault on 11 February broke deeply into the Finnish position in the Summa-Lähde sector after prolonged artillery preparation and repeated attacks against the same defensive system. Soviet troops widened the penetration over the following days as Finnish units fought to hold adjoining sectors and organise a withdrawal. The breach threatened the coherence of the main position across the western Isthmus. On 15 February the Finnish command ordered the main forces back toward the intermediate position. The strategic question shifted from preserving the Mannerheim Line to preserving an…
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