What I don't get, is why there are only victories enlisted up there. The greatest military achievement doesn't have to be a victory.
The Finnish stand against the Soviet union was at the time seen as a defeat and the Moscow Peace of 1940 as a "Häpeärauha" (=shameful peace) and "Sanelurauha" (=dictated peace), due to the fact that large areas had to be ceded to an agressor. All population of the ceded areas relocated itself. Finland had to find housing for 15 % of the population which extracted itself from the ceded areas.
However bad the Moscow peace of 1940 felt at the time, later it has been understood how great the achievment was.
And, I believe, that Finland defense is way overrated. All credit should go to the soldier's heroism, climate, and Soviet fault's, not to the brilliant defenses strategy,extraordinary fighting doctrine or anything that may be considered "most impressive military achievement" .
Usually the result is the most important thing adjudged, more often not the means.
As I wrote in an earlier post, the war had two faces, a trench war on the Carelian Isthmus and a mobile war north of it.
Please look into the battles of lake Tolvajärvi, Suomussalmi and the Raattee road, amongst others, before you underrate defensive strategy and fighting doctrine.
On the Carelian Isthmus the Materialschlacht didn't give much space for movements.
You have no idea how the war actually looked like, yet you voted on that only because small country beaten the big one. Smart.
As noted, the Finns did note beat the large country, but inflicted enough losses to retain independence.
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A less known fact is that when Finland had to choose between starving and retaining the lost area in conjunction with the Germans, and a few years later, when the Germans were not winning any more, in 1944, 3 days after D-day Russia attacked on the Carelian Isthmus with 450 000 troops, 10 500 artillery pieces, 800 tanks and 1 600 airplanes against 75 000 troops,1 900 artillery pieces, 110 tanks and 248 airplanes of Finns at the Isthmus, the Finns after loosing some ground and moving reinforcements in, stopped the russian advance in the largest battle to date in the Nordics, the battle of Tali - Ihantala. This was the only stategic offensive of the ten stategic offensives that the Soviet Union undertook, that was stopped. This was not against the bumbling and fumbling Red Army of 1939, but the battle tried and coordinated military machine of 1944, which the Finns had not understood to prepare against, since they were preparing to fight the last war again. They did, however, recover relatively fast.
In the Winter War the Finns had 200 000 troops at the Isthmus. However, in 1944 the firepower of the both sides were at a different level.
When the Soviet Stavka realised that the offensive was ground to a halt, they shipped of a large part of the troops to operation Bagration.
Due to stopping this strategic offensive of the USSR the only three capitals in the warring countries, that were not occupied at one time or another during the war, were London, Moscow and Helsinki. Keeping the aggressor out of most of the country also mean that civilian casualties were extraordinary low compared to the countries swept by fronts.
This extraordinary defensive victory was not touted after the war, due to understandable political reasons.