London, Feb. 10.
Another gigantic effort to crack the Mannerheim Line has been begun by the Russians, and is developing into the most serious onslaught since the beginning of the war, according to neutral reports received here. This latest attack, which extends right across the Karelian isthmus, is being accompanied by heavy fighting on cther fronts.
According to a semi-official statement issued at Helsinki, the Russians have not gained "a single yard of territory" in the attacks which began yesterday in the Summa sector, considered the most vulnerable spot in the Mannerheim Line.
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