 The largest bombing raid against the capital of Finland , Helsinki , occurred on the first day of the war . The capital was bombed only a few times thereafter . All in all , Finland lost only 5 % of total man @-@ hour production time because of Soviet bombings . Nevertheless , Soviet air attacks affected thousands of civilians , killing 957 , as the Soviets recorded 2 @,@ 075 bombing attacks in 516 localities . The city of Viipuri , a major Soviet objective close to the Karelian Isthmus front , was almost levelled by nearly 12 @,@ 000 bombs . No attacks on civilian targets were mentioned in Soviet radio or newspaper reports . In January 1940 , the Pravda continued to stress that no civilian targets in Finland had been struck , even by accident . 
